Resonation element, resonator, oscillator, electronic device and moving object

A resonation element comprising:

• a basal portion;
• at least one resonating arm extending out in a first direction from the basal portion;
• and
• a single crystal silicon substrate in which a length along a second direction perpendicular to the first direction is set to a thickness,
• wherein the resonating arm is flexurally vibrated along a third direction perpendicular to the first direction and the second direction, and
• wherein when a resonation frequency of the resonating arm is set to F [kHz], a width along the third direction of the resonating arm is set to W [μm], and a length along the first direction of the resonating arm is set to L [μm],
• at least one expression of the following Expression (1) and the following Expression (2) is satisfied,
• W<10A×Log (F)+B (1)
• where, A is −5.006×10−1, and B is 2.451, and
• L<10C×Log (F)+D (2)
• where, C is −7.507×10−1, and D is 4.268.