There are provided an interleaved power factor correction circuit and a power supply device including the same, the power factor correction circuit including: a main switching unit including a first main switch and a second main switch; an auxiliary switching unit including a first auxiliary switch and a second auxiliary switch; an inductor unit positioned between an input power terminal to which the input power is applied and the main switching unit and storing or discharging power according to the switching operations of the main switching unit; and an auxiliary inductor adjusting an amount of current flowing in the auxiliary switching unit when the auxiliary switching unit performs switching operations.