PROBLEM TO BE SOLVED: To provide a lifting device of a seat member having a high degree of freedom in layout of an installation position of a drive source as well as layout of an entire device.SOLUTION: A lifting device 1 of a seat member comprises: a seat member 2 a link mechanism 3 for elevating and lowering the seat member 2 through a path which is curved in at least one portion a guide member 4 for guiding the seat member 2 and a drive unit 5 for driving the seat member 2. The drive unit 5 comprises: a drive part 51 which is attached to the link mechanism 3 directly or indirectly and extends and contracts by a fluid and a circulation tube 52 which is connected to the drive part 51 and in which the fluid from a fluid source is circulated. The link mechanism 3 is at least extended by the extension or contraction of the drive part 51, and the seat member 2 is driven. The seat member 2 reciprocates between an upper side of a top edge of a bathtub edge and a position closer to a bathtub bottom part than the top edge of the bathtub edge.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2016,JPO&INPIT【課題】駆動源の設置位置のレイアウトや、装置全体のレイアウトの自由度が高い腰掛部材の昇降装置の提供を目的とする。【解決手段】本発明の腰掛部材の昇降装置1は、腰掛部材2と、腰掛部材2を、少なくとも一部がカーブする経路で昇降させるリンク機構3と、腰掛部材2を案内するガイド部材4と、腰掛部材2を駆動する駆動装置5とを備え、駆動装置5は、リンク機構3に直接または間接的に取付けられ、流体により伸縮駆動する駆動部51と、駆動部51と接続し、流体源からの流体が流通する流通管52とを有し、駆動部51の伸長又は収縮によりリンク機構3が少なくとも伸長して腰掛部材2が駆動され、腰掛部材2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ことを特徴とする。【選択図】図1
