How do those overlapping roofs connect? What lies inside the white keep?
Knowing how the castle is built reveals new details, even in a familiar view. A little reading before your visit, or before raising your camera.
01
Understanding the Layout
Four Connected Keeps
Three smaller keeps stand around the main keep. Four roofed passage towers, called watari-yagura, connect them around a courtyard.
An AI-assisted architectural illustration based on published sources and the previous layout diagram, with English labels. North is up. Roof shapes, building sizes and planting are schematic, not an exact representation of the castle.
Not one keep, but four connected buildings
The main keep commands attention from the front, but the Inui, East and West keeps stand around it. The I, Ro, Ha and Ni passage towers connect them. The term renritsu-shiki, a linked group of keeps, becomes easier to understand when you follow the roofs.
Positions, roof tiers and floors+ Read more− Close
The number of exterior roof tiers does not necessarily match the number of interior floors. Floor counts follow the City of Himeji designated cultural properties list.
One to the east, one to the west. The two 24.6-metre pillars rise from the basement to just beneath the sixth floor, the topmost floor of the keep.
An AI-assisted architectural illustration based on published references and the earlier structural diagram. The two great pillars are shown in red. This schematic explains their relationship to the floors and horizontal beams; shapes and dimensions are simplified. The west pillar's third-floor joint is simplified. The east pillar's repaired base joint and fine joinery are omitted.
Look beyond the pillars to the connecting timbers
Both pillars connect to horizontal timbers at each floor. Look at how these members fit together as well as at the massive posts themselves, and the timber framework hidden behind the castle’s exterior begins to emerge.
The west pillar joint and four structural groups+ Read more− Close
The west pillar consists of two timbers joined at the third-floor level. The keep can also be understood as four structural groups: basement to second floor, third floor, fourth floor, and fifth to sixth floors. The great pillars and horizontal timbers connect these groups.
The diagram marks the location of the joint, not its actual joinery profile.
On Site / Before the Paid Entrance
See the old west pillar before entering the keep
In Sannomaru, before the paid entrance, the old west pillar that once supported the keep is on display. It served for roughly 350 years before being replaced during the major Showa restoration. It is not the pillar standing inside today, but seeing that long timber lying before you conveys a scale that is difficult to grasp inside the building.
A close view, at ground level, of the timber that supported the keep.Photograph: Toji Masaya / 17 March 2026
An upper and a lower timber make one pillar
The old west pillar joined a lower section of fir (momi) to an upper section of hemlock (tsuga), above the third-floor boards. Compare the display labels 上柱 (upper pillar) and 下柱 (lower pillar): what appeared to be one great post was made from two trees.
Upper timber at the back, lower timber in front. The beam between them is a separate member. These are the old timbers displayed apart, not the pillar assembled at its joint.Photograph: Toji Masaya / 17 March 2026
The surfaces also bear cuts for connections to other members and traces of later repairs. Not every visible notch belongs to the joint between the upper and lower timbers.
East and west: different reasons for joining
West pillar
Originally made from an upper and lower timber. Replaced with new hinoki cypress during the Showa restoration, it still consists of two sections joined at the third-floor level.
East pillar
Originally one unjointed fir timber. During the Showa restoration, its bottom 5.4 metres were replaced with Taiwan cypress and spliced to the retained original timber above.
“Two timbers in the west, one in the east” does not fully describe the pillars today. The east pillar also has a splice where its damaged base was replaced. Their differences tell a story of both original construction and the repairs needed to preserve it.
The new west pillar was meant to be one timber+ Read more− Close
During the major Showa restoration (1956–1964), decay was found inside the old west pillar and replacement became necessary. The plan was to use a single long hinoki cypress timber.
But the selected log broke while being hauled out of the mountains. Two timbers were therefore joined at the third-floor level, as before. The present west pillar still bears witness to the challenges faced by the restoration team.
The sign lists an upper timber of 12.4 metres, a lower timber of 14.5 metres and an overlap of 2.2 metres at the joint. Subtracting that overlap from the combined lengths gives a total of 24.7 metres.
The 24.7-metre figure comes from the sign for the old pillar on display. The structural diagram above uses 24.6 metres, as given in the official guide’s description of the great pillars.
The on-site sign used for this explanation. It also describes the repair to the east pillar’s base.Photograph: Toji Masaya / 17 March 2026Photograph: Toji Masaya / View from the top floorView No.28: shachi roof ornaments and the night view
Hafu are the gables that shape the roofline; gegyo are the pendants beneath them. Compare the triangles, curves and small ornaments at their tips to discover the character of these overlapping roofs.
Roof outlines and the ornaments beneath them, with English labels. The blue lines trace the three gable forms; the lower-right detail distinguishes the upper pendant from the green kaerumata below.
Three kinds of gable
Irimoya-hafu 入母屋破風
The triangular gable at the end of a hip-and-gable roof. Its connection to the main roof ridge distinguishes it from a chidori-hafu.
Chidori-hafu 千鳥破風
A decorative, subsidiary gable projecting from partway down a roof. It gives the main roof an accent; examples with windows also admit daylight.
Noki-karahafu 軒唐破風
A gently curved karahafu gable incorporated into the eaves. Its flowing outline contrasts with the triangular gables.
Gegyo: pendants beneath the gable
A gegyo hangs at the central tip of a gable and conceals the end of the ridge timber. Look for these three forms at Himeji Castle.
Kabura-gegyo 蕪懸魚
A form widely used on the keeps. Notice the outline hanging down from the centre.
Mitsubana-kabura-gegyo 三花蕪懸魚
A combination of three kabura forms, producing a more elaborate silhouette that spreads to both sides.
Umebachi-gegyo 梅鉢懸魚
A pentagonal pendant often used on chidori gables.
Unokedoshi and kaerumata: compare their positions+ Read more− Close
兎毛通 (unokedoshi) is a horizontally extended pendant fitted to a curved karahafu gable. 蟇股 (kaerumata), shown in green in the diagram, is a different member on the small wall below the curved eaves. Position, as well as shape, helps distinguish them.
Himeji Castle's whiteness does not stop at its walls. It extends beneath the eaves, over window lattices and between dark roof tiles. Follow those white lines to discover the craft that protects a timber castle.
An AI-assisted schematic based on published sources, not a measured drawing. Shapes and thicknesses are not to scale. Pan and cover tiles are also shown separately in cross-section.
Wrapping a timber castle, from walls to eaves
In the finish known as shiro-shikkui so-nurigome-zukuri, white lime plaster covers not only the earthen walls concealing the columns but also details beneath the eaves, rafters, window lattices, gables and pendant ornaments. It gives the castle its white appearance while helping protect its timber from fire.
Timber posts and beams support the building. A lattice of branches or other laths holds the wall earth, which is finished with white plaster. The cutaway distinguishes the load-bearing frame, the lath, the earthen wall and the surface finish.
White lines between dark tiles
Himeji Castle's hongawara-buki roof combines pan and cover tiles. Lime mortar applied at joints, including those between cover tiles, helps protect against rain and wind. The contrast between dark tiles and white joints also contributes to the castle's white appearance.
Pan tiles hiragawara
Shallow, concave tiles laid with the hollow facing upwards to carry rainwater down the roof slope.
Cover tiles marugawara
Semicylindrical tiles placed over the joints between neighbouring rows of pan tiles.
The raised lines on a roof can make the two hard to distinguish. Look at their cross-sections: a pan tile forms a channel for water; a cover tile caps a joint.
Plaster thickness and the craft of repair+ Read more− Close
The plaster on the main keep's exterior walls is described as approximately 30 mm thick. This is not a uniform specification for the entire castle: thickness and composition vary by location.
The white surface has not survived untouched for centuries. Craftspeople have renewed it through successive conservation campaigns, including the major Showa-era repairs and the Heisei-era conservation work. Traditional materials and plastering skills sustain the appearance we see today.
Between the large stones, and behind them, lie the details that help support the castle. Explore the internal structure in the diagram, then compare it with photographs of the walls and a reused stone coffin.
The structure supporting the walls, and the history preserved in stone. This AI-assisted schematic draws on published sources and the on-site sign; stone shapes, proportions and positions are not measured representations.
Large stones do not stand alone
Between the large stones forming the face are smaller stones that fill gaps or help the larger stones sit securely. Rubble behind the face lets water pass through and helps drainage. The visible stones, the stones between them, and the stone and earth behind all play a part in supporting the wall.
Seven parts of the cross-section+ Read more− Close
Top stones tenba-ishi
The stones forming the top course of the wall.
Facing stones tsuki-ishi / hira-ishi
The main stones forming the exposed face of the wall.
Gap-filling stones mazume-ishi
Small stones packed into gaps between the stones on the face.
Packing stones kai-ishi
Stones placed between larger stones to steady their seating. The diagram shows them in dark grey between the illustrated courses, from the top stones down to the foundation.
Rubble backing uragome-guriishi
Stones packed behind the facing stones. They let water pass through and help drainage.
Earth fill morido
Built-up earth behind the rubble backing.
Foundation stones ne-ishi
The lowest stones, forming the base of the wall.
The number and positions of packing stones in the diagram explain their role; they do not mean that every wall uses the same spacing.
What repairs revealed inside the walls
Repairs at Kuruma Gate revealed rubble backing about 50 cm wide, with sandy earth fill behind it. Tuff was used for the facing stones, and wedge holes, called ya-ana, used to split stone were also found. Repair records reveal choices of stone and construction methods that cannot be understood simply by looking at the outside.
This is the Kuruma Gate investigation reported in bulletin No.106 of the Himeji City Castle Research Office. The backing width and stone type do not apply to every wall in the castle.
Large and small stones, seen in photographs
On site, start by comparing the large facing stones with the small stones between them. At your feet, where you may once have passed while looking up at the keep, you can see the work of fitting different sizes of stone together.
Look at the outlines of the large stones and the small stones filling the gaps. The backing and the stones supporting the seating of larger blocks cannot be verified from the exterior alone.Photograph: Toji MasayaCompare the masonry: stone dressing and corners+ Read more− CloseA comparison of stone dressing. Actual shapes, courses and gaps vary from place to place.
Nozura-zumi
Mostly undressed stones retain their natural shapes. Smaller stones also fill the gaps.
Uchikomi-hagi
Contact areas are dressed to reduce gaps, while the exposed surfaces retain some irregularity.
Kirikomi-hagi
Carefully dressed joints fit closely together. Examples survive in parts of the Sannomaru.
Look at the corners and the curve
Sangi-zumi alternates the direction of long stones at a corner. It describes corner construction, rather than the degree of stone dressing. The west side of Bizenmaru also shows the rising curve known as the “fan slope.”
Stone size alone cannot date a wall. Compare places with an eye to rebuilding and later additions, too.
What the stone was before it became a wall
Beside the entrance to Bizen Gate, the body of a stone coffin from an ancient burial mound stands upright, reused in the wall. Without the explanation, it might look like a well-dressed large stone. Stone once used for burial now supports the castle. Knowing its earlier purpose changes how you see the wall.
The wall beside Bizen Gate, where a reused coffin stone survives. Evening light reveals its height and the layered stones.Photograph: Toji Masaya / March 2026The on-site “Stone Coffin” sign+ Read more− Close
The sign identifies the stone beside Bizen Gate as the body of a coffin. It also explains that side and base slabs from coffins assembled from separate stones were reused in other walls. A reused coffin need not appear as an intact box.
The on-site sign explaining the coffin stone's origin and location.Explanation: on-site sign / Photograph: Toji Masaya
Surviving stones and stories passed down
The Ubagaishi legend
A story tells of an elderly woman who offered her stone handmill to help build the castle. The existence of reused stone and the legend explaining a donation should be understood separately.
Marks carved into stone
Some marks may be linked to stone supply; the meaning of others remains unknown. The circle with three dots and the square are schematic examples, not marks that uniformly identify a particular worker or quarry.
