What an ishigaki is
An ishigaki is a retaining wall of stacked stone. Castles are not its only setting: house plots on sloping ground are terraced with it, and walls are founded on it.
Domestic walls can be substantial. The stone and earthen walls at the Fukuda Residence in Wakayama Prefecture, built between the late Edo period and the Taisho era, are described as a front wall four metres high and 98 metres long, finely laid in Nunozumi with a curved batter, an earthen wall of 63 metres finished in Shikkui and roofed in Sangawara-buki, and a rear wall of 56 metres in the same coursing, the scale giving the property the air of a castle.
The stone and earthen walls at the Itani Residence in Ehime Prefecture, from about 1893, are described as a wall of natural stone in Nozurazumi about a metre high over 44 metres. The south wall on the same property reaches 2.7 metres and gives the house the character of an old mountain estate.
Walls are recorded as cultural property in their own right, and entries are named for them accordingly.
Three axes of description
Records describe a wall along three axes: how the stones are worked, how the courses run, and how the corner is built. The wall at Meisekiji in Ehime Prefecture, built in 1930 and 1944, is described as 3.8 metres high with steps, laid in Uchikomi-hagi in irregular courses, with Sangi-zumi at the outer corner given a curved batter. All three appear in one sentence.
Working runs through three degrees, from unworked through roughly dressed to Kirikomi-hagi. Coursing divides between level and irregular. Corners are locked with interlocking stones. Further axes cover whether a binder was used, as in Karazumi, and diagonal patterns such as Yahazu-zumi.
Differences in method can mark differences in date. The wall at the former Mori Residence in Hyogo Prefecture, built between the mid-Edo period and the Taisho era, is described as unworked stone along the middle and western parts of its north side, the middle slightly later with a more regular corner, and squared stone of 1912 along the east.
The curved batter recurs in these entries. Raising the face on a gentle curve rather than vertically demands accuracy at the corner, which is where the curve has to be carried through.
References
- Agency for Cultural Affairs: Registered tangible cultural properties (structures)
- https://www.bunka.go.jp/seisaku/bunkazai/shokai/yukei_kenzobutsu/toroku_yukei.html
- National Cultural Properties Database: Fukuda Residence stone wall, four metres high and 98 long, in level courses with a curved batter
- https://kunishitei.bunka.go.jp/bsys/maindetails/101/00009216
- National Cultural Properties Database: Itani Residence stone wall, natural stones laid uncut to about one metre high over 44 metres
- https://kunishitei.bunka.go.jp/bsys/maindetails/101/00009399
- National Cultural Properties Database: Meisekiji stone wall, roughly dressed stones in irregular courses with interlocking corners
- https://kunishitei.bunka.go.jp/bsys/maindetails/101/00006327
- National Cultural Properties Database: former Mori Residence wall, uncut stone with well-formed interlocking corners
- https://kunishitei.bunka.go.jp/bsys/maindetails/101/00007283
Last verified: 2026.09.11