Ultrasonic motor

An ultrasonic motor includes an annular stator, a rotor, a rectangular parallelepiped multilayer piezoelectric transducer, a support shaft, three transducers with drivers, a holder for holding the transducers with an elastic plate therebetween, and a leaf spring for urging the holder. The holder having the transducers is inserted into transducer attaching holes arranged at positions where the circumference of the stator is divided into three parts in a state wherein the holder is urged by the leaf spring from the back of the holder. The leaf spring abuts and urges the drivers of the transducer against a hardwearing ring fixed to the outer circumference of the rotor on the side of the internal circumference of the stator. When the transducer is driven so as to excite an elliptical movement produced in the drivers by combining a bending standing-wave vibration with a longitudinal vibration, the rotor is rotated relative to the stator. This ultrasonic motor can be used for a drive source of an object of rotation with small frictional loss and improved conversion efficiency.