A camera body is provided that includes a base member, a body mount, a focal plane shutter and a fastening member. The body mount is configured to support an interchangeable lens. The fastening member is configured to fasten the focal plane shutter unit to the base member. The body mount, the base member, and the focal plane shutter unit are disposed between a subject side of the camera body and a user side of the camera body in that order. The focal plane shutter unit is fastened to the base member that faces toward the user side of the camera body.