In an active matrix liquid crystal display device, the driver of a gate signal line is provided with a low-supply-voltage drive section and a high-supply-voltage drive section. A level shifter circuit in the high-supply-voltage drive section is made up of two CMOS circuits, to which a supply voltage Vdd2 (high-voltage power supply) is applied. Also, to two n-channel TFWs Tr3 and Tr7 in the level shifter circuit is applied a bias voltage Vdd1 (low-voltage power supply) which is a supply voltage different from the above supply voltage. This structure can prevent a high load from being exerted on only one n-channel TFT, thereby being capable of making the withstand voltage high.