A mounting structure of a leg member includes a bottom plate constituting a housing and a leg member. A first female screw hole is formed on the bottom plate. The leg member includes a leg member main body and a support column. The support column has a first male screw member and a shaft member. In case the first male screw member is screwed into the first female screw hole and passes from a bottom surface side to a top surface side of the bottom plate, the shaft member is loosely fitted in the first female screw hole and the first male screw member is locked to the top surface.