a discharge circuit unit for minimizing standby power occurring in a standby mode and an image forming apparatus having the same are provided . the discharge circuit unit is connected to an input line of alternating current power and discharges a capacitive element for reducing noises . the discharge circuit unit includes a discharge circuit including first and second resistance units connected in series to discharge the capacitive element in response to a discharge control signal generated when an input of the ac power is interrupted , and a detection circuit that detects whether the input of the ac power is interrupted , and includes third and fourth resistance units connected in series so as to generate the discharge control signal when it is detected that the input of the ac power is interrupted . each of the first to fourth resistance units includes at least one of a resistor and a switch .