Ultrasonic transducer

An ultrasonic transducer comprising:

• a case including a bottom wall;
• a piezoelectric element disposed on the bottom wall inside the case;
• a wiring member electrically connected to the piezoelectric element;
• a foaming member disposed on the piezoelectric element;
• a vibration damping material disposed between the piezoelectric element and the foaming member;
• and
• a filler filled in the case and opposing the vibration damping material via the foaming member, wherein:
• the foaming member has a bottom surface opposing the piezoelectric element in a thickness direction of the piezoelectric element, a plurality of depressions being formed on the bottom surface, and
• the vibration damping material bonds the piezoelectric element and the bottom surface.

An ultrasonic transducer comprising:

• a case including a bottom wall;
• a piezoelectric element disposed on the bottom wall inside the case;
• a wiring member electrically connected to the piezoelectric element;
• a foaming member disposed on the piezoelectric element;
• and
• a vibration damping material disposed between the piezoelectric element and the foaming member, wherein:
• the foaming member has a bottom surface opposing the piezoelectric element in a thickness direction of the piezoelectric element, a plurality of depressions being formed on the bottom surface,
• the vibration damping material bonds the piezoelectric element and the bottom surface, and
• an average aspect ratio of cells of the foaming member is 1.2 or more and 2.5 or less.