A level shifter is operated at high speed. An input unit 2 generates a first one-shot pulse signal at the rise of an input signal and a second one-shot pulse signal having the same polarity as the first one-shot pulse signal at the fall of the input signal, and eliminates the generated first and second one-shot pulse signals using an output signal. A level shift unit 3 includes a level shift circuit LS1 that converts the signal level of the first one-shot pulse signal and a level shift circuit LS2 that converts the signal level of the second one-shot pulse signal. An output unit 4 is driven corresponding to the first and second one-shot pulse signals whose levels have been shifted and generates the output signal. A hold unit 1 maintains the level of the generated output signal.