A quartz crystal device includes a crystal resonator element and a package including a plurality of components. The plurality of components are bonded using a metal paste sealing material containing a metallic particle having an average particle size from 0.1 to 1.0 μm, an organic solvent, and a resin material in proportions of from 88 to 93 percent by weight, from 5 to 15 percent by weight, and from 0.01 to 4.0 percent by weight, respectively, to hermetically seal the crystal resonator element in the package.