A semiconductor device includes a first electrode; a second electrode; a resin case surrounding the first electrode and the second electrode; and a resin insulating part made of a material the same as a material of the resin case and covering part of the first electrode and part of the second electrode inside the resin case. The resin insulating part contacts an inner wall of the resin case or is separated from the inner wall of the resin case. A move positioned between the first electrode and the second electrode is formed at the resin insulating part, and thus a space in which the resin insulating part does not exist or a material different from the resin insulating part is provided between the first electrode and the second electrode.