Method of manufacturing a resonator device adapted for suppression of fluctuation in resonant resistance

A method of producing a resonator device comprising:

• a first step of dividing a piezoelectric substrate having driving electrodes formed in advance on its main opposing surfaces, into individual vibrating elements of resonator devices through cutting,
• a second step of forming terminal electrodes to be impressed with driving signals on an insulating substrate and then, mounting said vibrating element on said insulating substrate in such a way that said driving electrodes are electrically connected with said terminal electrodes, and
• a third step of sealing said vibrating element mounted on said insulating substrate by placing a protection cap thereon,
• wherein a surface active agent is applied to at least said vibrating element while any of said first to third steps being carried out, said surface active agent consisting of a macromolecular material having the structural formula:
• ##STR3## where R is alkyl, and having a molecular weight of 50 to 300.