An electronic device chassis includes a base plate for disposing an electronic device circuit thereon, and a cover for the electronic device circuit housing. The base plate includes a bottom portion and a wall portion. The wall portion includes a screw fastening portion including a contact surface that contacts the cover. The cover includes a screw hole for attaching the base plate. The contact surface of the screw fastening portion is higher than an upper surface other than the contact surface of the wall portion. The upper surface portion covers the side of the housing space facing the base plate. The external side surface cover is provided at a peripheral edge of the upper surface cover portion, and extends toward the base plate so as to be longer than a difference between the contact surface of the screw fastening portion and the upper surface of the wall portion.