PROBLEM TO BE SOLVED: To switch a drive mechanism between a manual mode and an electrically-driven mode while suppressing costs.SOLUTION: A bed device 10 includes: a bed 11 having a back bottom 18 and a leg bottom 19； a support frame 12 for supporting a movable bottom 18 or 19 which is at least one of the back bottom 18 and the leg bottom 19, so that it can rotate around a rotating shaft 22； and a drive mechanism 14 for rotating the movable bottoms 18 and 19 around the rotating shaft 22. The drive mechanism 14 is detachably attached to the support frame 12.SELECTED DRAWING: Figure 6【課題】費用を抑えつつ手動式と電動式の駆動機構を切り替える。【解決手段】寝台装置１０は、背ボトム１８および脚ボトム１９を有する寝台１１と；背ボトム１８および脚ボトム１９のうちの少なくとも一方である可動ボトム１８、１９を回動軸２２回りに回動自在に支持する支持架台１２と；可動ボトム１８、１９を回動軸２２回りに回動させる駆動機構１４と；を備え、駆動機構１４が、支持架台１２に着脱自在に取り付けられる。【選択図】図６
