A level shifter includes a first output terminal and a second output terminal. After an output signal in a high level state is outputted from the first output terminal and an inverted output signal in a low level state is outputted from the second output terminal, a weak driving circuit is connected between the first output terminal and a power supply voltage, and a strong driving circuit is connected between the second output terminal and the power supply voltage. After the output signal in the low level state is outputted from the first output terminal and the inverted output signal in the high level state is outputted from the second output terminal, the strong driving circuit is connected between the first output terminal and the power supply voltage, and the weak driving circuit is connected between the second output terminal and the power supply voltage.