Vibration device

A vibration device, comprising:

• a tubular body including a cavity, a first opening end surface, and a second opening end surface;
• a vibrating element joined to the first opening end surface of the tubular body;
• and
• a translucent cover joined to the second opening end surface of the tubular body to cover the cavity of the tubular body;
• wherein
• the tubular body and the vibrating element are joined to each other with a first adhesive layer;
• the tubular body and the translucent cover are joined to each other with a second adhesive layer;
• when a thickness of the first adhesive layer is denoted as t1, a thickness of the second adhesive layer is denoted as t2, an absolute value of deformation of the first adhesive layer in a thickness direction of the first adhesive layer when a first stress is imposed on the first adhesive layer in the thickness direction is denoted with |Δt1|, and an absolute value of deformation of the second adhesive layer in a thickness direction of the second adhesive layer when a second stress is imposed on the second adhesive layer in the thickness direction is denoted with |Δt2|, a relationship between the absolute value |Δt1| and the absolute value |Δt1| when the first adhesive layer and the second adhesive layer receive equal stress is |Δt1|>|Δt2|.