A piezoelectric oscillator comprising an oscillating body formed of a plate-shaped material having a circular or polygonal circumference; and (4/3)n piezoelectric elements (5 - 16) that are secured to at least one of main surfaces of the oscillating body in order to generate an n-wave traveling wave where n is a natural number, the travelling wave being generated by combining two B (1, n) mode standing waves that are out of phase with each other by 90° due to oscillation of the oscillating body, the travelling wave travelling so as to travel in a circular path, the (4/3)n piezoelectric elements being distributed in the circumferential direction of the travelling wave, wherein, when a central angle around a center of the circumferential direction corresponding to a wavelength of the travelling wave is given by λ θ, each piezoelectric element has a dimension corresponding to a central angle of λ θ /2, and adjacent piezoelectric elements are spaced apart from each other at intervals each corresponding to a central angle of λ θ /4 in the circumferential direction, and wherein each piezoelectric element includes a piezoelectric body polarized in a thickness direction and a pair of electrodes (5b, 5c) formed on two opposite surfaces of the piezoelectric element, the piezoelectric bodies of the piezoelectric elements being polarized in one or the other thickness direction so as to alternate for every two piezoelectric elements in the circumferential direction; characterised by the piezoelectric oscillator further comprising a plurality of contacts provided so as to protrude from one of the main surfaces of the oscillating body, the contacts being formed from an annular wall distributed in an annular area where the travelling wave propagates. (4/3)n piezoelectric elements (5 - 16) that are secured to at least one of main surfaces of the oscillating body in order to generate an n-wave traveling wave where n is a natural number, the travelling wave being generated by combining two B (1, n) mode standing waves that are out of phase with each other by 90° due to oscillation of the oscillating body, the travelling wave travelling so as to travel in a circular path, the (4/3)n piezoelectric elements being distributed in the circumferential direction of the travelling wave, wherein, when a central angle around a center of the circumferential direction corresponding to a wavelength of the travelling wave is given by λ θ, each piezoelectric element has a dimension corresponding to a central angle of λ θ /2, and adjacent piezoelectric elements are spaced apart from each other at intervals each corresponding to a central angle of λ θ /4 in the circumferential direction, and wherein each piezoelectric element includes a piezoelectric body polarized in a thickness direction and a pair of electrodes (5b, 5c) formed on two opposite surfaces of the piezoelectric element, the piezoelectric bodies of the piezoelectric elements being polarized in one or the other thickness direction so as to alternate for every two piezoelectric elements in the circumferential direction; characterised by the piezoelectric oscillator further comprising a plurality of contacts provided so as to protrude from one of the main surfaces of the oscillating body, the contacts being formed from an annular wall distributed in an annular area where the travelling wave propagates.