A switching regulator that includes a switching transistor configured to control an output current by switching, a proportional current generator configured to generate a current proportional to a current flowing through the switching transistor, a first slope voltage generator configured to generate a linear slope voltage, a second slope voltage generator configured to generate a slope voltage having a secondary curve characteristic by integrating the current proportional to the current flowing through the switching transistor, and a slope voltage compensation circuit to generate a superimposed slope voltage formed by superimposing an output voltage of the first slope voltage generator on an output voltage of the second slope voltage generator.