Abstract: There is provided a semiconductor device capable of decreasing a switching loss. The semiconductor device has first semiconductor elements (Su)-(Sw) and second semiconductor elements (Sx)-(Sz) connected in series, in which the first semiconductor element includes a low switching loss semiconductor element having a switching loss which is smaller than a switching loss of the second semiconductor element and the second semiconductor element includes a low conduction loss semiconductor element having a conduction loss which is smaller than a conduction loss of the first semiconductor element.