To provide a noncontact electric power supply system capable of preventing an operation of a wireless mouse from getting disabled by an electric power supply-disabled state caused by coming-out of the wireless mouse out of a power supply capable area of a mouse pad.

In this noncontact electric power supply system 1 for the wireless mouse, the mouse pad 2 includes a position detecting means for detecting a position of the wireless mouse 3 on the mouse pad, a plurality of power supply coils Lp1, Lp2, Lpn arranged on an operation face of the mouse pad, a power supply selection means for selecting at least one of the power supply coils corresponding to the position of the wireless mouse detected by the position detecting means, out of the plurality of power supply coils, and an electric power supply means for supplying supply electric power to the power supply coil selected by the power supply selection means, and the wireless mouse includes the first charge accumulation means for condensing induced electric power obtained by electromagnetic induction between the selected power supply coil and a power receiving coil, into an electric double layer capacitor.