PROBLEM TO BE SOLVED: To detect a pressing motion appropriately even while a pressing place is soft, the pressing place to be pressed for controlling motions of a drive target by a boarding person boarding a sitting boarding device including the drive target.SOLUTION: The sitting boarding device includes: flexible fluid inclusion members 32A, 32B deformable by means of pressing by a boarding person； and pressing motion detection means detecting pressing motions by the boarding person by means of deformation of the fluid inclusion members. Drive control means 20 controls drive sources 13A, 13B driving drive targets 11A, 11B, based on a detection result of the pressing motion detection means.SELECTED DRAWING: Figure 1【課題】駆動対象を備えた座位搭乗装置に搭乗する搭乗者が、その駆動対象の動作をコントロールするために押圧する箇所を柔らかくしつつも、その押圧動作を適切に検知可能とする。【解決手段】搭乗者による押圧によって変形可能な柔軟性を有する流体封入部材３２Ａ，３２Ｂと、前記流体封入部材の変形により搭乗者による押圧動作を検知する押圧動作検知手段とを有し、駆動対象１１Ａ，１１Ｂを駆動させる駆動源１３Ａ，１３Ｂを制御する駆動制御手段２０は、前記押圧動作検知手段の検知結果に基づいて前記駆動源を制御する。【選択図】図１
