Vibration device for an article and vibration generating shoe

A vibration device comprising:

• a casing having an operating chamber formed therein;
• and
• a plurality of vibration plates, each having an extended plate shape with one end fixed to the casing and an opposite end freely disposed in a space within the operating chamber,
• wherein the vibration plates each has a first magnet attached to the free end of the vibration plate,
• wherein the casing has a plurality of second magnets, each fixed to an upper portion of the casing at a position above its corresponding first magnet of the vibration plate in such a manner as to have a repulsive force against the top surface of the first magnet, and wherein the casing further has a plurality of third magnets, each fixed to a lower portion of the casing at a position below its corresponding first magnet of the vibration plate in such a manner as to have a repulsive force against the underside surface of the first magnet, such that the free end of each vibration plate to which the first magnet is fixed is easily vibrated between its corresponding second magnet and its corresponding third magnet in response to external impact on the vibration device,
• wherein at least one of the vibration plates are fixed to one lateral side of the casing and the remaining vibration plate(s) is/are fixed to the opposite lateral side of the casing,
• wherein said at least one vibration plate(s) fixed to the one lateral side of the casing is/are longer than said remaining vibration plate(s) fixed to the opposite lateral side of the casing.