A digital still camera includes a lens mount mechanism, positioned on a front face of a camera body, for securing a lens assembly to the camera body removably. A door shaped cover is secured to the camera body, and shiftable between first and second positions while the lens assembly is removed. The door shaped cover, when in the first position, is closed on the front face to cover the lens mount mechanism, and when in the second position, is open from the front face to allow loading of the lens assembly and to operate as a grip. A flexible pad sheet of rubber is deformable resiliently when the door shaped cover is retained in the first position by a retaining mechanism, for tightly closing between the front face and a cover inner surface of the door shaped cover opposed to the front face.