Abstract: Aspects of the invention can provide a tuning-fork type piezo-oscillator piece, whose package, in which the tuning-fork type piezo-oscillator piece is mounted, is protected from colliding with oscillating arms even though a physical shock is given onto the tuning-fork type piezo-oscillator piece, and a mounting method thereof. The tuning-fork type piezo-oscillator piece can include a tuning-fork type piezo-oscillator piece main body equipped with a plurality of oscillating arms, a short side part formed along a direction perpendicular to the longitudinal direction of the tuning-fork type piezo-oscillator piece main body and connected to the tuning-fork type piezo-oscillator piece main body, and a long side part formed along the longitudinal direction of the tuning-fork type piezo-oscillator piece main body, while starting from the short side part, and equipped with a shock-absorbing part.