Abstract: A housing that houses a display panel includes a first wall and a second wall. A protrusion is formed on the first wall. A through hole is formed in the second wall. The protrusion passes through the through hole. A tip of the protrusion that has been passed through the through hole is expanded to fasten the first wall to the second wall. A clearance between the protrusion and the through hole is divided into a first part and a second part. The first and second parts are unequally allocated so that when a force from a front side to a back side of the display panel is applied to the first wall/second wall, the first wall/second wall is suppressed from being displaced relative to the second wall/first wall.