An output device receives a data signal, outputs an output signal corresponding to the data signal in synchronization with a clock signal, and includes a driving unit configured to drive an output buffer that outputs the output signal. The driving unit includes a signal switching unit and first and second driving circuits that operate with the same power supply. The signal switching unit inputs the clock signal into one of the first and second driving circuits in accordance with the level of the data signal, and the one of the first and second driving circuits outputs a driving signal whose level varies in accordance with a change in the level of the clock signal to the output buffer.