An outer shell panel includes: a front panel which is provided on a front surface portion of a body casing; and side panels which are arranged on side surface portions of the body casing. The side panels each include: a base member which is provided on a side end portion of the front panel; a connecting member has a flat plate shape and has no light transmissivity, the connecting member including a first surface and a second surface formed on to the opposite side of the first surface, and being attached to the base member, with the first surface located to face the base member; and a design panel which has a flat plate shape and has light transmissivity, the design panel being attached to a peripheral edge of the connecting member to be opposite to the second surface of the connecting member.