a switching control circuit comprises : an error amplifying circuit configured to output an error voltage obtained by amplifying an error between a feedback voltage corresponding to an output voltage and a lower voltage selected out of a first reference voltage increasing with time passage and a second reference voltage used as a reference for a target level ; a comparison circuit configured to output a comparison signal obtained by comparing the feedback voltage with the error voltage output from the error amplifying circuit ; and a drive circuit configured to output first and second control signals for controlling first and second transistors , respectively , in order to turn the output voltage to the target level by complementarily turning on and off the first and second transistors , after the error voltage exceeds the feedback voltage , based on the comparison signal output from the comparison circuit .