A casing 10 is included. The casing 10 includes a left side face panel 4 constituting one side face portion of the casing 10 and a part of a front face portion of the casing 10 adjacent to the side face portion, a front face left side panel 2 constituting the front face portion of the casing 10 together with the left side face panel 4, and the top face panel 7 constituting a top face portion of the casing 10. The front face left side panel 2 includes a temporary fixing stop portion 2a at an upper end portion. The temporary fixing stop portion 2a projects toward a back side of the casing 10. The left side face panel 4 includes a temporary fixing rectangular hole 4a at an upper end portion of a front face side. The temporary fixing stop portion 2a is inserted into the temporary fixing rectangular hole 4a. The front face left side panel 2 and the left side face panel 4 are fixed on the front face side of the casing 10. The temporary fixing stop portion 2a and the temporary fixing rectangular hole 4a are covered by the top face panel 7.