Piezoelectric device

A piezoelectric device producing output according to deformation of a composite piezoelectric body, the piezoelectric device comprising:

• a substrate that is flexible and thermally deformable;
• and
• a composite piezoelectric body disposed on the substrate, the composite piezoelectric body including:
• a piezoelectric layer containing an organic binder and piezoelectric particles,
• a first electrode layer stacked on a first surface side of the piezoelectric layer, and
• a second electrode layer stacked on a second surface side of the piezoelectric layer,
• wherein the substrate is insert molded and integrated with a molded resin body having a curved shape;
• the substrate is formed of a thermoplastic resin;
• the organic binder is formed of a thermoplastic resin;
• the first electrode layer contains a first binder resin which is a thermoplastic resin, and first conductive particles dispersed in the first binder resin;
• the second electrode layer contains a second binder resin which is a thermoplastic resin, and a second conductive particles dispersed in the second binder resin;
• and
• the organic binder has a melt viscosity at 250° C. of 300 Pa·s or more.