A bidirectional DC/DC converter includes a bidirectional DC/AC conversion circuit including a push-pull circuit connected between voltage terminals and a winding and having a switching element and a switching element coupled to opposing ends of the winding respectively, and an up-conversion circuit coupled to the push-pull circuit and the voltage terminals, and the up-conversion circuit includes an inductor for allowing passage of a current through the winding, the switching element in an ON state and the switching element in an ON state owing to stored magnetic energy, and a switching element forming a current path going through the voltage terminal, the inductor and the voltage terminal but not through the switching element and the switching element as it is turned on.