To provide a flywheel as an energy storage means which can be available in a wide variety of industrial fields by adding a power storage function to original functions of the flywheel.

The flywheel with power storage function has a structure in which a power storage device 2 is provided on a flywheel body 1 and connected to an electric circuit 3 by using an electric wiring 5, and an induction coil 4 is connected to the electric circuit 3 so that power can be supplied and received contactlessly to/from the outside in an electromagnetic system via the induction coil 4.