PURPOSE: To prevent the vibration damping caused by a protrusion of an adhesive agent by allowing a releasing agent onto a vibration area generated by a vibration electrode.

CONSTITUTION: In a piezoelectric resonator 10, vibration electrodes 1a, 1a are provided on both main surfaces of a piezoelectric substrate 1, releasing agents 4, 4 are applied so as to cover a vibration area A generated by these vibration electrodes 1a, 1a, and protective substrates 2, 2 are stuck through an adhesive agent 3 to a prescribed part except the vibration area A of the piezoelectric substrate 1. The protective substrate 2 is provided with a projecting part 2a, and a void is formed between the protective substrate 2 and the piezoelectric substrate 1. Accordingly, the adhesive agent 3 used for sticking the piezoelectric substrate 1 and the protective substrate 2 is pressed, and even if it protrudes, it is repelled by the releasing agent 4 applied to the vibration area A and does not intrude into the vibration area A. In such a way, piezoelectric resonator in which the vibration damping caused by a protrusion of the adhesive agent 3 scarcely occurs can be obtained.