Semiconductor module, semiconductor device, and electric power device

The objective of the invention is to provide a semiconductor module efficiently electrically connected to a snubber circuit module and effectively inhibiting a surge voltage. In the semiconductor module (100), at least one snubber circuit module (200) is attachable/detachable to/from an interior (7a) communicated with a snubber-circuit-connecting opening (7); a plurality of snubber-circuit electrodes for electrically connecting with the at least one snubber circuit module (200) are joined with a circuit pattern; the plurality of snubber-circuit electrodes are disposed in the interior (7a) of the snubber-circuit-connecting opening (7); in a state that the snubber circuit module (200) is attached in the interior (7a) of the snubber-circuit-connecting opening (7), the snubber circuit module (200) does not stick out from an outer surface of an outer enclosure member (6), the plurality of snubber-circuit electrodes are in surface-contact with electrodes in the side of the snubber circuit module (200), respectively