Flexible circuit board on bus bars

A circuit board including a plurality of conductive pieces that are connected to terminals of a semiconductor element and are provided flush with each other, and an insulation region arranged between the conductive pieces, the circuit board comprising:

• a first conductive piece to which the semiconductor element is fixed;
• a conductive sheet that is connected to a second conductive piece via a first connection portion and electrically connects a first terminal of the semiconductor element to the second conductive piece;
• and
• a second connection portion that is provided in the conductive sheet and electrically connects the first terminal and the second conductive piece.