A window regulator includes a guide rail provided along an ascending/descending direction of a window for a vehicle, a carrier plate that slides on the guide rail and moves together with the window, a window power feed wire for supplying power to the window, a swing bar arranged to be swingable about the rotational axis thereof that is along a width direction of the vehicle, and an elastic member that generates an elastic force for oscillation the swing bar in a predetermined direction. The window power feed wire is hung over the swing bar, and a tension is applied to the window power feed wire by oscillation of the swing bar due to the elastic force of the elastic member.