PIEZOELECTRIC VIBRATION PIECE, PIEZOELECTRIC VIBRATOR, OSCILLATOR, ELECTRONIC APPARATUS AND RADIO-CONTROLLED TIMEPIECE

摘要

PROBLEM TO BE SOLVED: To provide a piezoelectric vibration piece which can be suppressed from being vibrated in a secondary bending mode while suppressing deterioration in strength of a vibration arm, and a piezoelectric vibrator, and also to provide an oscillator, an electronic apparatus and a radio-controlled timepiece which include the piezoelectric vibrator and are excellent in reliability.SOLUTION: An embodiment of a piezoelectric vibration piece of the present invention includes: a base; and a pair of vibration arms connected to the base and disposed to be arranged in a width direction. On a main surface of each of the vibration arms, a plurality of grooves arranged in a width direction and extending in a length direction of the vibration arms and a connection groove for connecting a plurality of grooves adjacent each other are formed. A wall is formed between grooves adjacent each other along a length direction. At least a part of the wall is provided further on a tip side than the center of the grooves in a length direction, and the connection groove connects the grooves adjacent on the tip side.