Piezoelectric coaxial sensor and method for manufacturing piezoelectric coaxial sensor

A method for manufacturing a piezoelectric coaxial sensor, the method comprising:

• preparing a sensor portion including a center conductor having a linear shape, a polymer piezoelectric layer containing polyvinylidene fluoride and that covers an outer peripheral surface of the center conductor, and a first outer conductor that surrounds an outer peripheral surface of the polymer piezoelectric layer;
• and
• forming jacket layers that each include a film having a tape shape wound to surround an outer peripheral surface of the sensor portion, wherein
• forming the jacket layers includes forming at least one of the jacket layers exposed to outside of the piezoelectric coaxial sensor among the other jacket layers, and
• forming the at least one of the jacket layers exposed to the outside includes:
• winding the film to be the at least one of the jacket layers exposed to the outside around an outer peripheral surface of a member in contact with an adhesive layer to surround the outer peripheral surface of the sensor portion;
• and
• heating the sensor portion around which the film to be the jacket layer exposed to the outside is wound at 120° C. or lower to adhere the film to the member by the adhesive layer,
• the adhesive includes a thermoplastic resin having a melting point of 120° C. or lower.