Ultrasonic transducer

An ultrasonic transducer (1) is provided with a base part (14), a piezoelectric element (11), a vibration plate (10), and a resonator (12). A resonator (12) is joined to a first surface (21) of a diaphragm (10). The second surface (22) of the vibrating plate (10) is bonded to the surface of the piezoelectric element (11) on the opposite side from the side bonded to the base section (14). The piezoelectric element (11) is provided with a through hole (30) penetrating in the thickness direction of the vibrating plate (10). In a plane direction orthogonal to the thickness direction of the vibrating plate (10), a joint portion (40) where the vibrating plate (10) and the resonator (12) are joined is disposed further inward than a node (20) of vibration of the vibrating plate (10), and the through hole (30) is disposed further inward than the node (20). 超声波换能器(1)包括基底部(14)、压电元件(11)、振动板(10)以及共振子(12)。在振动板(10)的第1面(21)接合有共振子(12)。在振动板(10)的第2面(22)接合有压电元件(11)的与接合于基底部(14)的一侧相反的那一侧的面。在压电元件(11)形成有沿振动板(10)的厚度方向贯通的贯通孔(30)。在与振动板