PROBLEM TO BE SOLVED: To mount a variety of functions while suppressing complication of a structure.SOLUTION: A bed device includes: a bed 11 having a back bottom 18； and a support frame 12 having a rotation mechanism 25 located above the bed 11 for holding the back bottom 18 so as to rotate it around a rotation shaft 22 extending in a right and left direction, which supports the bed 11. The rotation mechanism 25 includes a movable member 33 connected to the back bottom 18, and a fixed member 34 connected to the movable member 33 through the rotation shaft 22. An angle display unit 50 is provided to the movable member 33 or the fixed member 34 for displaying a rotation angle of the back bottom 18 based on a relative positional relationship around the rotation shaft 22 of the movable member 33 and the fixed member 34.SELECTED DRAWING: Figure 7【課題】構造の複雑化を抑えつつ多様な機能を実装する。【解決手段】寝台装置は、背ボトム１８を有する寝台１１と；寝台１１の上方に位置して左右方向に延びる回動軸２２回りに背ボトム１８を回動自在に保持する回動機構２５を有し、寝台１１を支持する支持架台１２と；を備え、回動機構２５が、背ボトム１８に連結された可動部材３３と、可動部材３３に回動軸２２を介して連結された固定部材３４と、を備え；可動部材３３または固定部材３４に、可動部材３３および固定部材３４の回動軸２２回りの相対的な位置関係に基づいて、背ボトム１８の回動角度を表示する角度表示部５０が設けられている。【選択図】図７
