Power module, power converter device, and electrically powered vehicle

A power module 300 and a power converter device 300 including the power module 300 include: two base plates with their main surfaces facing each other; a semiconductor circuit unit 300A disposed between the two base plates; a connecting member 304A that is connected to the two base plates and forms a housing region in which the semiconductor circuit unit 300A is housed; and an insulating member 334A that is placed between the base plate and the semiconductor circuit unit 300A and secures electrical insulation of the base plate and the semiconductor circuit unit 300A. A rigidity or thickness of the connecting member 304A is less than a rigidity or thickness of the base plate.