Resonator device, oscillator, electronic apparatus, and vehicle

A resonator device comprising:

• a substrate;
• a resonator element including;
• a base member having a first surface and a second surface opposed to each other;
• and
• a pair of excitation electrodes respectively disposed on the first surface and the second surface and including a first metal layer and a second metal layer disposed on an opposite side of the first metal layer to the base member;
• and
• a first bonding member and a second bonding member arranged in a first direction along a first side of the resonator element, and bond the substrate and the resonator element to each other,
• wherein defining a center of a surface on the resonator element side of the first bonding member as a first bonding center, a center of a surface on the resonator element side of the second bonding member as a second bonding center, a center of a resonating region sandwiched by the pair of excitation electrodes in a planar view viewed from a direction perpendicular to a surface of the pair of excitation electrodes as a resonating region center, and
• defining a distance between the first bonding center and the second bonding center as L1, a length of a perpendicular drawn from the resonating region center to an imaginary line connecting the first bonding center and the second bonding center to each other as L2, a linear expansion coefficient of the first metal layer as α1, a linear expansion coefficient of the second metal layer as α2, a linear expansion coefficient of the base member as α3, and a length in the first direction of the resonator element as L3,
• 0<L1/L2≤0.97, |(α2−α1)/α1|≤0.35, |(α3−α1)/α1|≤0.35, and L3≤1.5 mm are satisfied.