Ultrasonic motors using a piezoelectric ceramic vibrator with diagonally symmetric form were proposed in this paper. The 1st longitudinal and the 2nd flexural modes in a diagonally symmetric form plate are coupled in the vibrator its size ratio about W/L=0.26 and 0.65 (W:vibrator width, L:vibrator length).In this paper, we performed a few experiments using the vibrator with the ratio in 0.65. That is, FEM simulation results of two vibration modes and resonant frequencies of the vibrator and a construction and revolution character-rustics of a trial motor are shown.