A synchronous rectification switching regulator includes a reverse current
prevention circuit unit that detects a symptom of a reverse current
flowing in a direction from an output terminal to a second switching
element or a generation of the reverse current based on a voltage of a
connecting portion for connecting the second switching element with a
third switching element. The reverse current prevention circuit unit
turns off the third switching element to interrupt the reverse current
when the reverse current prevention circuit unit detects the symptom or
the generation of the reverse current.