A waterproof type electronic device is composed of a disc lid 13 capable of opening and closing an opening portion (17) of a camera apparatus body (2), a buckle (12) capable of detachably fastening the disc lid (13) to the camera apparatus body (2) and a sealing member (24) provided on at least one of the buckle (12) and the camera apparatus body (2) to hermetically seal the buckle 12 and the camera apparatus body (2). When the disc lid (13) is fastened to the camera apparatus body (2) by the buckle (12), the camera apparatus body (2) is hermetically sealed at least at its part of the portion covered with the buckle (12). In this kind of related-art waterproof type electronic device, operation buttons are not formed so as to have waterproof structures and water and water component can therefore enter this waterproof type electronic device relatively easily. If the operation buttons are formed so as to have waterproof structures, then such waterproof structures are increased in space from a structure standpoint and hence the overall arrangement of the apparatus may not be made compact in size.