Sealing member for piezoelectric resonator device, and piezoelectric resonator device

A sealing member for a piezoelectric resonator device, the piezoelectric resonator device comprising a piezoelectric resonator piece and a plurality of sealing members hermetically sealing a resonance region of the piezoelectric resonator piece,

• wherein the sealing member comprises a base material having one principal surface and the base material comprises a protruding portion on the one principal surface,
• wherein the base material has another principal surface having a flat surface and a curved surface, the flat surface being a region corresponding to the protruding portion, the curved surface being a region other than the region of the flat surface,
• wherein the sealing member comprises a plurality of external terminals on the flat surface, the plurality of external terminals being to be connected to an external circuit board,
• wherein the sealing member comprises a plurality of inspection terminals only on the curved surface, the plurality of inspection terminals being configured to inspect the piezoelectric resonator piece,
• wherein the base material has a plurality of via holes passing through between both principal surfaces of the base material, and
• wherein an alignment of the plurality of via holes is inclined relative to any side of the other principal surface.