To provide a device which can generate electric power without producing any harmful material nor being supplied with a power generating raw material from the outside.

The poser generator is constituted in such a way that a nonextendible/nonshrinkable cable is connected to the rotating shaft of a generator and a magnet is installed to the other end of the cable. The magnet can generate electric power by rotating the rotating shaft of the generator when the magnet freely drops down due to the gravity. The revolving motion of the rotating shaft can be maintained by the attracting force and repulsive force between magnets installed on the outer periphery of the revolving track of the magnet installed to the other end of the cable, or electromagnets which are actuated by the generated power and the magnet.