This caster (10) comprises: a wheel (30)； a wheel support body (40) that rotatably supports the wheel； a load sensor (70) that is supported inside the wheel support body, and includes a strain-generating body (72) and a strain gauge (71)； and a stopper (80) that is provided inside the wheel support body so as to be capable of coming into contact with and separating from the strain-generating body of the load sensor, the stopper coming into contact with the strain-generating body when the amount of deformation of the strain-generating body reaches a predetermined value due to a load applied to the strain-generating body, and preventing the strain-generating body from deforming beyond a predetermined amount.
