Provided is a crystal-oscillating device that can be reduced in size and that has an excellent Q factor. A crystal-oscillating device (1) provided with a first packaging material (2), a crystal oscillator (7) mounted on the first packaging material (2), joining materials (9, 10) provided to join the first packaging material (2) and the crystal oscillator (7), a second and a third packaging material (3, 4) provided on the first packaging material (2), a first sealing frame (5) provided to join the first packaging material (2) and the second packaging material (3), and a second sealing frame (6) provided to join the second packaging material (3) and the third packaging material (4); the second packaging material (3) being frame-shaped and formed to enclose the outer peripheral edge of the crystal oscillator (7), and the second packaging material (3) and a crystal substrate (7a) for forming the crystal oscillator (7) being formed from the same crystal substrate.