Patent ID: 8232707

Claim:
A flexural vibration piece comprising: a flexural vibrator that has a first region on which a compressive stress or a tensile stress acts due to vibration and a second region having a relationship in which a tensile stress acts thereon when a compressive stress acts on the first region and a compressive stress acts thereon when a tensile stress acts on the first region, and performs flexural vibration in a first plane; and a heat conduction path, in the vicinity of the first region and the second region, that is formed of a material having a thermal conductivity higher than that of the flexural vibrator and thermally connects between the first region and the second region, wherein when m is the number of heat conduction paths, α th is the thermal conductivity of the heat conduction path, α v is the thermal conductivity of the flexural vibrator, t v is the thickness of the flexural vibrator in a direction orthogonal to the first plane, and t th is the thickness of the heat conduction path, a relationship of t th ≧(t v /m)×(α v /α th ) is satisfied.