PROBLEM TO BE SOLVED: To enable a user of a wheelchair to attach/detach the wheelchair to/from a floor surface by himself/herself.SOLUTION: Lock bars STK_L and STK_R arranged in a wheelchair 20 are respectively displaceable in a vertical direction and in a direction around center axes while allowing the center axes to keep vertically extending postures. Lock tools FEG_L and FEG_R are respectively arranged at multiple positions on a floor surface of a welfare vehicle in response to position relation between the lock bards STK_L and STK_R when viewing the wheelchair 20 from above in order to fix the wheelchair 20 to the floor surface. The lock bars STK_L and STK_R are removably locked to the lock tools FET_L and FEG_R by being respectively displaced in the vertical direction and the direction around the center axes.SELECTED DRAWING: Figure 7COPYRIGHT: (C)2017,JPO&INPIT【課題】車椅子使用者が自力で車椅子を床面に着脱できること。【解決手段】車椅子20に設けられた係止棒STK_LおよびSTK_Rの各々は、中心軸が上下方向に延在する姿勢を保ちつつ、上下方向および中心軸の回り方向に変位可能である。係止具FEG_LおよびFEG_Rは、車椅子20を福祉車両の床面に固定するべく、車椅子20を上方から眺めたときの係止棒STK_LおよびSTK_Rの位置関係に対応して、床面の複数の位置にそれぞれ設けられる。係止棒STK_LおよびSTK_Rは、上下方向および中心軸の回り方向に各々を変位させることで、係止具FEG_LおよびFEG_Rと着脱自在に係止される。【選択図】図7