The An object of the present invention is to insertion and removal structure who wish to buttocks holding body in contact with the buttocks of the caregiver that came taken to (toilet, shower, chair for relaxation, wheelchair, bets, etc. favorite) from the buttocks This is to provide the buttocks holder stable holder to stabilize retention. A buttocks holder stable holder is made from the support structure 2 to support this as a side plate 1, buttocks holding member 12 for holding the butt portion 14 of the care people 13 which is held in a structure The consists of those to be mounted stably held. The side plate 1 of the buttocks holder stable holder 100 is composed of what is horizontally overhanging at the top surface and the same height of the structure. .BACKGROUND【課題】希望する構造物(便器,シャワー,寛ぎ用椅子,車椅子,好みのベット等)に運ばれて来た被介護人の尻部に当接している尻部保持体を尻部から挿脱しこれを安定保持する尻部保持体安定保持具を提供する。【解決手段】尻部保持体安定保持具は側面板1とこれを支持する支持構造体2からなり、構造物に保持されている被介護人13の尻部14を保持する尻部保持体12を安定的に搭載保持するものからなる。この尻部保持体安定保持具100の側面板1は構造物の上面と同一高さで水平に張り出しているものからなる。【選択図】図1