The present invention provides a switching regulator for controlling the overshoot voltage which is generated during transition from power ON, when soft start activates, to normal operation, when the load side output is maintained at the output setting voltage by the feedback circuit. A clamp circuit is disposed between a soft start circuit and an error amplifier, an upper limit value from the output of the soft start circuit (SS) to the output of the error amplifier (FB) is set, so that the rise of voltage of the output of the error amplifier (FB) is controlled when power is turned ON, and time until the output of the error amplifier (FB) is stabilized is decreased, by which the overshoot voltage generated in the load side output (VOUT) is controlled.