PROBLEM TO BE SOLVED: To provide a lifting/lowering device of a seat member allowing a user to give a bather a bath with little load and to compactly install a device in a bathtub, and capable of improving stability of the seat member.SOLUTION: A lifting/lowering guide member 13 disposed along one side wall of a bathtub, guides a second side edge of a seat member 11 between a first position located on the upper side of an upper end of the bathtub edge, or on the upper side of the upper end of the bathtub and outside the bathtub, and a second position located closer to a bathtub bottom than the upper end of the bathtub edge. Upper parts of link mechanisms 12 are connected to a part that is closer to a first side edge of the seat member 11 than the center thereof, and a second side edge of the seat member 11 that is located at an opposite side of the first side edge. The lower ends of the link mechanisms are located at the bathtub bottom and lift/lower the seat member 11 on a passage that is curved at least partially, such that the seat member 11 reciprocates between the upper side of the upper end of the bathtub edge and a position closer to the bathtub bottom than the upper end of the bathtub edge.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2016,JPO&INPIT【課題】入浴者を少ない負担で入浴させることができ、且つ、浴槽に装置をコンパクトに設置でき、さらに、腰掛部材の安定度を高くできる腰掛部材の昇降装置を提供する。【解決手段】浴槽の一つの側壁に沿って配置された昇降ガイド部材13が、腰掛部材11の第2の側縁部を、浴槽縁の上端の上方、或いは、浴槽縁の上端より上方且つ浴槽外側の第1の位置と、浴槽縁の上端より浴槽底部に近い第2の位置との間で案内し、リンク機構12は、上端が腰掛部材11における中央より第1の側縁部に近い部位及び第1の側縁部の反対側にある腰掛部材11の第2の側縁部に接続され、下端が浴槽底部に位置し、腰掛部材11を、少なくとも一部がカーブする経路で昇降させて、腰掛部材11が浴槽縁の上端の上方と、浴槽縁の上端より浴槽底部に近い位置との間を往復移動する。【選択図】図1
