A piezoelectric device includes a piezoelectric thin film formed by separating and forming a piezoelectric single crystal substrate, an inorganic layer formed on a back surface of the piezoelectric thin film, an elastic body layer disposed on a surface opposite to the piezoelectric thin film of the inorganic layer, and a support pasted to a surface opposite to the inorganic layer of the elastic body layer. In a membrane structure portion, the inorganic layer and the elastic body layer are disposed on the piezoelectric thin film through a gap layer. The elastic body layer reduces a stress caused by pasting the piezoelectric thin film including the inorganic layer and the support and has a certain elastic modulus. The inorganic layer is formed with a material having an elastic modulus higher than that of the elastic body layer and suppresses damping caused by disposing the elastic body layer.