A motor frame comprising four side surfaces, built-up portions and leg members is provided. The four side surfaces define the outer circumference of the motor frame. The four side surfaces include a terminal box mounting surface on which a terminal box is provided and two side surfaces located on respective sides of the terminal box mounting surface. The built-up portions are provided on each of the two side surfaces, wherein two or more bolt holes can be formed on the built-up portions. The built-up portions are configured such that any of hanging bolts or the leg members can be fastened to the built-up portions. The hanging bolts are screwed into bolt holes formed on one of the two side surfaces and the leg members are fastened to bolt holes formed on the other of the two side surfaces.