A couch device according to an embodiment includes a couchtop, shape control members, and driving circuitry. The couchtop includes a movable base couchtop and a transformable couchtop mounted above the movable base couchtop and capable of bending a part thereof from a flat shape. The shape control members control the shape of the transformable couchtop. The driving circuitry moves the couchtop to an opening of a gantry device that collects data for taking medical images. The transformable couchtop includes divided couchtops, and transformation support members for fixing the transformable couchtop to the movable base couchtop are fitted to divided sections. Each of the shape control members adjusts a position of a specific transformation support member so that an installation location thereof is a fixed point of the movable base couchtop.
