Patent ID: 7851980

Claim:
A tuning fork flexural crystal vibration device comprising: a base having a flat plate shape; two vibration arms having flat panel shapes extending from a side surface of said base in the same direction; a plurality of grooves which are provided for said two vibration arms so as to extend from base-side end portions of said vibration arms along a longitudinal direction of said vibration arms and are depressed in a thickness direction of said vibration arms, said plurality of grooves including front-side grooves which open in front main surfaces of said vibration arms and are provided at least one by one for each vibration arm, and rear-side grooves which open in rear main surfaces of said vibration arms and are provided at least one by one for each vibration arm, and said front-side groove having a bottom surface not facing a bottom surface of said rear-side groove provided in said same vibration arm in which said front-side groove is provided; a plurality of electrodes which are formed on surfaces of said base and said two vibration arms; and wirings which electrically connect said plurality of electrodes to each other.