To provide a crystal device, especially a tuning fork resonator, that blockades the penetration section of a vessel body for maintaining the degree of vacuum satisfactorily.

In the crystal device, at least a crystal chip 1 is stored in the insulating vessel body 2 for covering, and the penetration section 7 that is provided in the vessel body 2 and has a step is blockaded by metal in a vacuum atmosphere for vacuum sealing. In this case, a metal film made of Au is provided on the surface of the step at the penetration section 7, an annular projection 9a that is provided at the periphery of a metal plate 9 plated with Ni and rotates around the metal plate 9 comes into contact with the metal film, the metal film is joined to the annular projection 9a of the metal plate 9 by resistance welding for energizing between the metal film and the metal plate 9, and the penetration section 7 is blockaded.

COPYRIGHT: (C)2008,JPO&INPIT