A vibrating element includes: an element plate that has a vibrating portion that performs thickness-shear vibration, a peripheral portion that is integrally formed with the vibrating portion, and a protruding portion that is provided at the peripheral portion; and an excitation electrode that is provided at the vibrating portion. When a side length of the vibrating portion is Mx, when a side length of the excitation electrode is Ex, and when a wavelength of flexure vibrations of the element plate is λ, the relationship of (Mx−Ex)/2=λ/2, and Mx/2={(A/2)+(¼)}λ (where, A is a positive integer) is satisfied, and when a length of the protruding portion is Dx, and when a distance between the vibrating portion and the protruding portion is Sx, the relationship of Dx=λ/2)×m, and (λ/2)×n−0.1λ≦Sx≦(λ/2)×n+0.1λ (where m and n are positive integers) is satisfied.