An ultrasonic motor (7, 8) for causing elliptical vibrations at a contacting point with a driven object by utilizing bending vibrations and longitudinal vibrations, comprising: a vibrator formed by stacking a plurality of rectangular piezoelectric plates (31, 32, 35, 38) in a thickness direction; a driving circuit for applying a driving signal to a piezoelectric plate (32, 35); and a detection circuit for detecting an electromotive force generated when the piezoelectric plate deforms, wherein: there are a first piezoelectric plate and a second piezoelectric plate among the plurality of rectangular piezoelectric plates (31, 32, 35, 38); the first piezoelectric plate and the second piezoelectric plate each is a piezoelectric plate in which a longitudinal vibration polarization portion formed by longitudinal vibration electrodes (34, 37) and adapted to excite the longitudinal vibrations and a bending vibration polarization portion formed by bending vibration electrodes (33, 36) and adapted to excite the bending vibrations are polarized in a thickness direction; the first piezoelectric plate is connected to the driving circuit and the detection circuit, and the second piezoelectric plate is connected to the driving circuit and is not connected to the detection circuit; and positions at which electric lines are connected to the vibrator are substantially symmetrical with respect to a plane perpendicular to a vibration direction of the longitudinal vibrations, said plane containing a center point of the vibrator length in a vibration direction of the longitudinal vibrations, characterized in that, in each of the first and second piezoelectric plates (32, 35), the bending vibration electrodes (33, 36) and the longitudinal vibration electrodes (34, 37) do not coexist on any plane that is perpendicular to the direction of the longitudinal vibrations. a vibrator formed by stacking a plurality of rectangular piezoelectric plates (31, 32, 35, 38) in a thickness direction; a driving circuit for applying a driving signal to a piezoelectric plate (32, 35); and a detection circuit for detecting an electromotive force generated when the piezoelectric plate deforms, wherein: there are a first piezoelectric plate and a second piezoelectric plate among the plurality of rectangular piezoelectric plates (31, 32, 35, 38); the first piezoelectric plate and the second piezoelectric plate each is a piezoelectric plate in which a longitudinal vibration polarization portion formed by longitudinal vibration electrodes (34, 37) and adapted to excite the longitudinal vibrations and a bending vibration polarization portion formed by bending vibration electrodes (33, 36) and adapted to excite the bending vibrations are polarized in a thickness direction; the first piezoelectric plate is connected to the driving circuit and the detection circuit, and the second piezoelectric plate is connected to the driving circuit and is not connected to the detection circuit; and positions at which electric lines are connected to the vibrator are substantially symmetrical with respect to a plane perpendicular to a vibration direction of the longitudinal vibrations, said plane containing a center point of the vibrator length in a vibration direction of the longitudinal vibrations, characterized in that, in each of the first and second piezoelectric plates (32, 35), the bending vibration electrodes (33, 36) and the longitudinal vibration electrodes (34, 37) do not coexist on any plane that is perpendicular to the direction of the longitudinal vibrations. there are a first piezoelectric plate and a second piezoelectric plate among the plurality of rectangular piezoelectric plates (31, 32, 35, 38); the first piezoelectric plate and the second piezoelectric plate each is a piezoelectric plate in which a longitudinal vibration polarization portion formed by longitudinal vibration electrodes (34, 37) and adapted to excite the longitudinal vibrations and a bending vibration polarization portion formed by bending vibration electrodes (33, 36) and adapted to excite the bending vibrations are polarized in a thickness direction; the first piezoelectric plate is connected to the driving circuit and the detection circuit, and the second piezoelectric plate is connected to the driving circuit and is not connected to the detection circuit; and positions at which electric lines are connected to the vibrator are substantially symmetrical with respect to a plane perpendicular to a vibration direction of the longitudinal vibrations, said plane containing a center point of the vibrator length in a vibration direction of the longitudinal vibrations, characterized in that, in each of the first and second piezoelectric plates (32, 35), the bending vibration electrodes (33, 36) and the longitudinal vibration electrodes (34, 37) do not coexist on any plane that is perpendicular to the direction of the longitudinal vibrations.