Abstract: A crystal-oscillating device is disclosed with a reduction in size and a favorable Q value. The crystal-oscillating device includes a first packaging material; a crystal resonator mounted on the first packaging material; joining members that join the first packaging material to the crystal resonator; a first sealing frame for joining the second and third packaging materials, the first packaging material, and the second packaging material; and a second sealing frame for joining the second packaging material and the third packaging material to each other. Preferable, the second packaging material is formed in a frame shape to surround an outer peripheral edge of the crystal resonator, and the second packaging material and a crystal substrate of the crystal resonator are formed from the same crystal substrate.