To provide an ion generating device which can prevent that a generation amount of ions decreases as time lapses.

Ion generating device 10, which has electrodes 51a, 51b, 52a and 52b, comprises an ion generation section 5 for generating ions when a high voltage is applied to the electrodes 51a, 51b, 52a and 52b, a high voltage application circuit 3 for creating a high voltage to apply the created high voltage to the electrodes 51a, 51b, 52a and 52b, and a control circuit 4 for controlling the high voltage application circuit 3. The control circuit 4 has a first operation mode of controlling the high voltage application circuit 3 so as to apply a first high voltage to the electrodes 51a, 51b, 52a and 52b, and a second operation mode of controlling the high voltage application circuit 3 so as to apply a second high voltage having a higher voltage value than the first high voltage to the electrodes 51a, 51b, 52a and 52b, and control by the second operation mode is inserted into control by the first operation mode.