PROBLEM TO BE SOLVED: To facilitate miniaturization of a body support device.SOLUTION: A body support device 10 includes: a base part 24 for receiving a load of a user; a rotation part 46 rotatably fixed to the base part 24 around a rotation axis L; a drive part 47 fixed to the base part 24 so as to rotate the rotation part 46; and a wire material 48 extending from the drive part 47 to the rotation part 46 and fixed to the rotation part 46. The drive part 47 rotates the rotation part 46 by pulling the wire material 48.SELECTED DRAWING: Figure 5