A driver circuit configured to increase or decrease a drive current flowing to a light emitting element in accordance with an input signal, the driver circuit including: an output terminal configured to be electrically connected between a bias current source and the light emitting element, and configured to draw an output current inward; a shunt circuit configured to generate a first current in accordance with the input signal; and a waveform shaping circuit configured to detect a rising transition of a voltage of the output terminal and generate a second current based at least in part on a result of detection, wherein the first current and the second current constitute the output current, Wherein the first current increases when the input signal increases, and decreases when the input signal decreases, and wherein the voltage of the output terminal rises when the output current decreases.