The image forming apparatus comprises: a liquid ejection head which has a plurality of nozzles and a plurality of pressure generating elements corresponding to the nozzles, and applies a drive signal to the pressure generating elements so as to eject recording liquid from the nozzles; a plurality of drive waveform generating circuits which generate the drive signal having waveform for driving the pressure generating elements; a plurality of dummy capacitive loads which are connected to the drive waveform generating circuits; and a circuit selection device which selects at least one of the drive waveform generating circuits for applying the drive signal to at least one of the pressure generating elements and the dummy capacitive loads.