A power semiconductor module (16, 18, 20) comprising: a first semiconductor element (41a, 51a) constituting an upper arm of one phase in a circuit of a first system for controlling a first electric motor; a second semiconductor element (41b, 51b) constituting a lower arm of the one phase in the circuit of the first system; a third semiconductor element (41c, 51c) constituting an upper arm of one phase in a circuit of a second system for controlling a second electric motor; a fourth semiconductor (41d, 51d) element constituting a lower arm of the one phase in the circuit of the second system; a first conductor electrically and mechanically joined to a positive electrode side of the first semiconductor element, and positive electrode side of the third semiconductor element; a second conductor electrically and mechanically joined to a negative electrode side of the second semiconductor element, and negative electrode side of the fourth semiconductor elements; a third conductor arranged between the first conductor and the second conductor, and electrically and mechanically joined to a negative electrode side of the first semiconductor element, and positive electrode side of the second semiconductor element; and a fourth conductor arranged between the first conductor and second conductor, and electrically and mechanically joined to a negative electrode side of the third semiconductor elements, and positive electrode side of the fourth semiconductor element; wherein the third conductor includes a first end opposed to the fourth conductor with a gap, and the fourth conductor includes a first end opposed to the first end of the third conductor, a second end opposite to the first end of the fourth conductor, and a groove-like notch extending from the first end to the second end of the fourth conductor; wherein a positive electrode output terminal is configured to extend from the first conductor; a negative electrode output terminal is configured to extend from the second conductor; a first AC output terminal is configured to extend from the first end of the third conductor and beyond the second end of the fourth conductor through the notch of the fourth conductor; and a second AC output terminal is configured to extend from the second end of the fourth conductor. a first semiconductor element (41a, 51a) constituting an upper arm of one phase in a circuit of a first system for controlling a first electric motor; a second semiconductor element (41b, 51b) constituting a lower arm of the one phase in the circuit of the first system; a third semiconductor element (41c, 51c) constituting an upper arm of one phase in a circuit of a second system for controlling a second electric motor; a fourth semiconductor (41d, 51d) element constituting a lower arm of the one phase in the circuit of the second system; a first conductor electrically and mechanically joined to a positive electrode side of the first semiconductor element, and positive electrode side of the third semiconductor element; a second conductor electrically and mechanically joined to a negative electrode side of the second semiconductor element, and negative electrode side of the fourth semiconductor elements; a third conductor arranged between the first conductor and the second conductor, and electrically and mechanically joined to a negative electrode side of the first semiconductor element, and positive electrode side of the second semiconductor element; and a fourth conductor arranged between the first conductor and second conductor, and electrically and mechanically joined to a negative electrode side of the third semiconductor elements, and positive electrode side of the fourth semiconductor element; wherein the third conductor includes a first end opposed to the fourth conductor with a gap, and the fourth conductor includes a first end opposed to the first end of the third conductor, a second end opposite to the first end of the fourth conductor, and a groove-like notch extending from the first end to the second end of the fourth conductor; wherein a positive electrode output terminal is configured to extend from the first conductor; a negative electrode output terminal is configured to extend from the second conductor; a first AC output terminal is configured to extend from the first end of the third conductor and beyond the second end of the fourth conductor through the notch of the fourth conductor; and a second AC output terminal is configured to extend from the second end of the fourth conductor.