A vibration device comprising: a first elastic plate including first and second end portions (2a4, 2a5) and a first planar section (2a1) located between the first and second end portions (2a4, 2a5); a second elastic plate joined to the second end portion (2a5) side of the first elastic plate , including a second planar section (2b1) opposed to and spaced with a gap from the first planar section (2a1) of the first elastic plate ; a piezoelectric vibrating element provided on the surface in the first planer section (2a1) of the first elastic plate that is facing the second elastic plate ; and a mass adding member attached to the first end portion (2a4) of the first elastic plate , wherein the second elastic plate has a flexural rigidity higher than the flexural rigidity of the first elastic plate , wherein the first elastic plate includes a first joining section (2a3) joined to the second elastic plate and a first linking section (2a2) that links the first joining section (2a3) and the first planar section (2a1), characterized in that the first joining section (2a3) is located further on the second end portion (2a5) side than the first linking section (2a2), and the first elastic plate is bent to the second elastic plate side in the first linking section (2a2), wherein the first joining section (2a3) extends from the first linking section (2a2) in a direction away from the first end portion (2a4), and the first joining section (2a3) includes a surface extending in parallel to the second planar section (2b1) of the second elastic plate and is joined to the second elastic plate on the surface and the second elastic plate is vibrated by receiving vibration of the first elastic plate 2a and the vibration is propagated to outside from the second elastic plate . a first elastic plate including first and second end portions (2a4, 2a5) and a first planar section (2a1) located between the first and second end portions (2a4, 2a5); a second elastic plate joined to the second end portion (2a5) side of the first elastic plate , including a second planar section (2b1) opposed to and spaced with a gap from the first planar section (2a1) of the first elastic plate ; a piezoelectric vibrating element provided on the surface in the first planer section (2a1) of the first elastic plate that is facing the second elastic plate ; and a mass adding member attached to the first end portion (2a4) of the first elastic plate , wherein the second elastic plate has a flexural rigidity higher than the flexural rigidity of the first elastic plate , wherein the first elastic plate includes a first joining section (2a3) joined to the second elastic plate and a first linking section (2a2) that links the first joining section (2a3) and the first planar section (2a1), characterized in that the first joining section (2a3) is located further on the second end portion (2a5) side than the first linking section (2a2), and the first elastic plate is bent to the second elastic plate side in the first linking section (2a2), wherein the first joining section (2a3) extends from the first linking section (2a2) in a direction away from the first end portion (2a4), and the first joining section (2a3) includes a surface extending in parallel to the second planar section (2b1) of the second elastic plate and is joined to the second elastic plate on the surface and the second elastic plate is vibrated by receiving vibration of the first elastic plate 2a and the vibration is propagated to outside from the second elastic plate . <EOS>