A hybrid circuit, comprising: a high-voltage circuit and a low-voltage circuit having different power supply voltages, respectively; a board on which a connecting terminal (21, 31) for connecting an external element outside of the hybrid circuit is mounted; and a hybrid integrated circuit mounted on the board, wherein the low-voltage circuit includes a control unit for controlling an operation of the high-voltage circuit; wherein the control unit and the high-voltage circuit are integrated in the hybrid integrated circuit, wherein the high-voltage circuit includes: a positive electrode side portion which is connected, under a control of the control unit, to a positive electrode of a high-voltage power supply; and a negative electrode side portion which is connected, under the control of the control unit, to a negative electrode of the high-voltage power; characterized in that the hybrid integrated circuit comprises a high-voltage circuit mounting area and a low-voltage circuit mounting area for mounting a part of the high-voltage circuit and a part of the low-voltage circuit, respectively, wherein the high-voltage circuit mounting area is disposed on a first side of the hybrid integrated circuit and the low-voltage circuit mounting area is disposed on a second side of the hybrid integrated circuit opposite to the first side of the hybrid integrated circuit; the positive electrode side portion comprises a first switch, a first resistor, and one end of a flying capacitor, and is disposed on a first side of the high-voltage circuit mounting area, and the negative electrode side portion comprises a second switch, a second resistor, and the other end of the flying capacitor, and is disposed on a second side of the high-voltage circuit mounting area opposite to the first side of the high-voltage circuit mounting area. a high-voltage circuit and a low-voltage circuit having different power supply voltages, respectively; a board on which a connecting terminal (21, 31) for connecting an external element outside of the hybrid circuit is mounted; and a hybrid integrated circuit mounted on the board, wherein the low-voltage circuit includes a control unit for controlling an operation of the high-voltage circuit; wherein the control unit and the high-voltage circuit are integrated in the hybrid integrated circuit, wherein the high-voltage circuit includes: a positive electrode side portion which is connected, under a control of the control unit, to a positive electrode of a high-voltage power supply; and a negative electrode side portion which is connected, under the control of the control unit, to a negative electrode of the high-voltage power; a positive electrode side portion which is connected, under a control of the control unit, to a positive electrode of a high-voltage power supply; and a negative electrode side portion which is connected, under the control of the control unit, to a negative electrode of the high-voltage power; characterized in that the hybrid integrated circuit comprises a high-voltage circuit mounting area and a low-voltage circuit mounting area for mounting a part of the high-voltage circuit and a part of the low-voltage circuit, respectively, wherein the high-voltage circuit mounting area is disposed on a first side of the hybrid integrated circuit and the low-voltage circuit mounting area is disposed on a second side of the hybrid integrated circuit opposite to the first side of the hybrid integrated circuit; the positive electrode side portion comprises a first switch, a first resistor, and one end of a flying capacitor, and is disposed on a first side of the high-voltage circuit mounting area, and the negative electrode side portion comprises a second switch, a second resistor, and the other end of the flying capacitor, and is disposed on a second side of the high-voltage circuit mounting area opposite to the first side of the high-voltage circuit mounting area.