To provide a triangular wave generating device.

A triangular wave generating device includes a capacitor connecting the output end and the ground, a charge/discharge unit having a plurality of current sources and charging or discharging the capacitor with currents outputted from the plurality of current sources, and a control unit for controlling the charge/discharge unit by comparing the charging voltage of the capacitor with a plurality of preset reference voltages, and differentiating the amount of current for charging or discharging the capacitor, for a plurality of sections formed by the plurality of reference voltages, respectively.