Vibration power generator, vibration power generating device, and electronic device and communication device that have the vibration power generating device installed

A vibration power generator comprising:

• a first substrate;
• a first electrode arranged on the first substrate;
• a second substrate spaced from and opposite to the first substrate;
• and
• a second electrode arranged on the second substrate, the first electrode vibrating with respect to the second substrate, any one of the first electrode and the second electrode including a film retaining electric charges,
• the vibration generator further comprising:
• a third electrode including a film retaining electric charges and arranged on the first substrate;
• and
• a fourth electrode including a film retaining electric charges and arranged on the second substrate, the third electrode and the fourth electrode being arranged so that the first substrate is retained in a predetermined position when an external force does not act on the first substrate, while an electrostatic force returning the first substrate to a predetermined position acts when an external force acts on the first substrate and the first substrate moves with respect to the second substrate,
• wherein the film retaining electric charges included in any one of the first electrode or the second electrode, the film retaining electric charges included in the third electrode, and the film retaining electric charges included in the fourth electrode retain electric charges with the same polarity.