Piezoelectric resonator element and piezoelectric device

A piezoelectric resonator element including: a base (51) formed by a piezoelectric material, having a given length; a plurality of vibration arms (35,36) extended from one end of the base; and a supporting arm extended from the other end apart from the one end of the base by the given length to a width direction so as to be extended to a same direction of the vibration arms at an outside of the vibration arms.