The present invention provides a driving device which comprises a piezoelectric element and a vibrating piece of the crimping part, and the surface of the piezoelectric element is arranged with the following components: a first electrode which is arranged at the approximate central part in the width direction of the piezoelectric element; a second electrode which is formed at two sides of the first electrode and is composed of a pair of electrodes that is in each two electrodes formed by bisecting approximately in the length direction of the piezoelectric element and are configured in the diagonal clamping the central axis in the length direction of the piezoelectric element; and a third electrode which is composed of a pair of electrodes which are configured with line symmetry along the central axis in the length direction of the piezoelectric element relative to the second electrode. The driving mechanism is configured for switching the following two states: exerting electric voltage on the first and the second electrode to lead to that the crimping part vibrates in one direction with an approximate elliptical orbit; and exerting the electric voltage on the first and the third electrode to lead to that the crimping part vibrates in the reverse direction with an approximate elliptical orbit thereby the driving direction of the driven piece can be selected.