The first main surface (12a) and the second main surface (12b), the first main surface (12a), and the second main surface that face each other with the X-axis direction as the long side and the Z′-axis direction as the short side An AT-cut type crystal piece including a first side surface (13) and a second side surface (14) located on the long side of the surface (12b), a first excitation electrode (15a), and a second excitation electrode (15b) And an extraction electrode electrically connected to the first excitation electrode (15a) drawn from the first main surface (12a) through the first side surface (13) to the second main surface (12b) In the width direction orthogonal to the long side in the X-axis direction, the width Wa1 of the first m surface (13a) of the first side surface (13) is the second m surface (14a) of the second side surface (14). ) Width Wa2.
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