PROBLEM TO BE SOLVED: To appropriately achieve heat dissipation of discharge resistance that functions when disconnection from a DC power source occurs and heat dissipation of a stabilizing power circuit in steady operation, and to reduce the size of an inverter control board.SOLUTION: An inverter control board comprises: a regulator element that supplies power to an inverter control circuit; a resistor for discharge, which, when a DC power source and an inverter are electrically disconnected, is electrically connected and discharges electric charges accumulated in a smoothing capacitor; a first discharge pad HD1 with which a regulator element is in contact; and a second discharge pad HD2 with which the resistor for discharge is in contact. The regulator element and the resistor for discharge are arranged adjacent to each other, and the first discharge pad HD1 and the second discharge pad HD2 are integrally formed as a first discharge pattern HDP1.SELECTED DRAWING: Figure 10
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