PURPOSE: To constantly feed by pressure contacting a movable unit on a vibrator in which an electrode is provided on one side surface of a cylindrical piezoelectric element and a plurality of electrodes are provided on the other to generate an elastic wave, thereby generating a uniform traveling wave in a small-sized motor.

CONSTITUTION: An electrode 11 is formed on the outer periphery of a cylindrical piezoelectric element 10, and a plurality of electrodes 121∼124 are formed on the inner periphery to be polarized from the inside to the outside as designated by an arrow C. When voltages which are phase-shifted at 90° are applied to the electrodes 121∼124 to generate radial vibrations having phases displaced at 90° in a portion interposed by the electrodes, the vibration travels along the circumferential direction. A shaft 3 is coaxially inserted into a vibrator 2, and the shaft 3 is secured to a holder 1. The vibrator 2 is disposed near a hole S formed at a part of the holder 1, an elastic unit 8 and a movable unit 5 made of a metal plate 9 are pressure contacted by rollers 6, 7 to be able to be reciprocated in the directions of arrows (a), (b). Thus, uniform traveling wave can be generated to constantly feed, thereby reducing the size of a linear elastic wave motor.