An electric power converter has a stacked body formed by stacking a plurality of semiconductor modules and coolers, a capacitor, and positive and negative bus bars. Each of the bus bars is formed by two sheets of plate members, respectively. Each of the plate members has a body portion, a plurality of extended portions, and a plurality of terminal connecting portions. The terminal connecting portions are connected to power terminals of the semiconductor modules. The main body portion of each plate member are joined to each other so that the terminal connecting portion of the one of the plate members and the terminal connecting portion 44 of the other one of the plate member are disposed alternately in a stacking direction of the stacked body.