PROBLEM TO BE SOLVED: To facilitate installation and height adjustment to a small space such as a bottom of a chair very easily, and furthermore prevent falling from an installation state and also reliably prevent positional displacement to the falling direction, and thereby support a heavy load and sufficiently bear a radical movement of a pet.SOLUTION: A storage box using a small space has a bottom 5, a box wall 6 standing up around an outer circumferential part of the bottom 5, and at least 3-tightening rings 7 arranged while diverging in the circumferential direction to an outer face of the box wall 6. The tightening rings 7 is mounted to the box wall 6 while winding bands 7A-7D formed in a belt shape and being wound to a supporting column 4 in a face contact state direct the band width direction to the height direction and through a connection part linearly formed in the height direction.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】椅子の下などの小スペースに対する取り付け及び高さ調整がいとも簡単に行え、しかも取り付け状態からの落下防止はもとより、落下方向への位置ズレも確実に防止して、重い荷物の支持や、過激なペットの動きなどにも十分に耐えられるようにする。【解決手段】底部5と、底部5の外周部を取り囲んで立ち上がる囲み壁部6と、囲み壁部6の外面に対して周方向に乖離して少なくとも3つが配置された緊締環7とを有し、緊締環7は、帯形状に形成されて支持柱4へ面接触状態に巻き付ける巻回帯7A~7Dが帯幅方向を高さ方向に向けた状態で且つ高さ方向に直線状に形成された結合部を介して囲み壁部6に取り付けられている。【選択図】図1