Semiconductor module and inverter device

A semiconductor module comprising:

• a base plate;
• a plurality of substrates placed on one surface of the base plate, with each substrate of the plurality of substrates including a switching element, a diode element, and a connection terminal area;
• and
• a parallel flow forming device that forms parallel coolant flow paths that are provided so as to be in contact with the other surface of the base plate, wherein:
• the coolant flow paths are formed such that coolant flows in a coolant flow direction,
• the switching element and the diode element are arranged in line in a perpendicular direction with respect to the coolant flow direction in each of the substrates,
• the plurality of substrates includes a plurality of sets of substrates, each set of substrates being formed of a pair of substrates, with the plurality of sets of substrates being arranged in line in the perpendicular direction, and the pair of substrates forming each of the sets of substrates being arranged in series in the coolant flow direction, and
• for each of the sets of substrates, the switching element of one substrate of the pair of substrates is arranged on one side in the perpendicular direction, and the diode element of the other substrate of the pair of substrates is arranged on the one side in the perpendicular direction.