A couch device including sliders axially supported by lower ends of both of link members, and including nut members. Guide rails substantially horizontally guide each slider. A screw member is arranged along the guide rail and is configured to apply a driving force to each slider when it is relatively rotated for each nut member and, due to the driving force, substantially horizontally transfer each slider. A clutch unit selectively carries out the operations of rotating one nut member integrated with the screw member such that the driving force is prevented from being applied to one slider, or relatively rotating one nut member for the screw member such that the driving force is applied to one slider. A binding unit binds one slider to the guide rail when the driving force is not applied to the one slider.
