PROBLEM TO BE SOLVED: To provide a synchronous rectifier controller capable of reducing the switching noise of a switching element, and also capable of improving the efficiency during synchronous rectification.SOLUTION: A synchronous rectifier controller (1A, 1B) comprises: a plurality of bridge-connected switching elements provided between an inductive load (2A, 2B) and a DC power source (3); a plurality of diodes for performing rectification, each connected in parallel to the switching elements; and a control device (7) for controlling the electrical continuity and cutoff states of the switching elements by applying a control voltage to the control electrodes of the switching elements, the control device (7) making the rising and falling edges of the control voltage applied to the control electrodes during synchronous rectification steeper than during switching of an electrical continuity pattern in one cycle of the electrical continuity pattern for controlling the drive of the inductive load (2A, 2B).
