This castle tower was sustained by 1.8 square meter space with five pillars; one main pillar with about 15m long and 45cm square meter cross section installed in the center, and other four sub-pillars with about 40cm square meter cross section installed in the each corner.
本柱長さ八間、本柱ふとさ一尺五寸四方、六尺四方、一尺三寸四方木。