An electronic device is formed by a cabinet having a bottom surface and is equipped with a tabular electronic part. The electronic device has an undersurface guiding rib. The top surface of the undersurface guiding rib is formed by an inclined surface and a supporting surface. The inclined surface guides a front end of an undersurface of the electronic part when inserted. The supporting surface is formed beside the inclined surface and supports the front end of the undersurface of the electronic part that is guided by the inclined surface and made horizontal with a rear end of the electronic part made lowered. An overhanging piece is disposed at a position above the undersurface guiding rib and supports a top surface on the front end of the electronic part that is made horizontal with the undersurface of the electronic part supported by the supporting surface of the undersurface guiding rib.