On the front wall on the second floor, jomon (family crest) of the Kawai clan, consisting of three vertical lines to assimilate the Chinese character delineating river (kawa in Japanese) in the igetawaku (similar to the Oxford frame) and hatajirushi (war banners used on the medieval Japanese battlefield) of the family composed of three vertically stacked diamonds are painted in black on the right and left hand sides, respectively.
2階正面の壁には、向かって右方に川の字の井桁枠で囲み川井氏の定紋を入れ、左には菱形3段に重ねた当家の旗印を付けている。