(Task)An ultrasonic actuator or the like which can be moved by a simple method and is inserted into a pipe body is provided. (Solution means)A coil-shaped driving part (12) extending in one direction and inserted into the inside of the tube body,A driving unit disposed at one end in one direction of the driving unit for receiving an ultrasonic wave from the outside of the tube body to resonate and generating a traveling wave traveling from the one end portion to the other end portion to the driving portion by the resonance An ultrasonic diagnostic apparatus comprising: a receiving unit (14) and an ultrasonic sensor disposed at the other end of the driving unit in one direction and receiving ultrasonic waves having a frequency different from a frequency at which the first receiving unit resonates from the outside of the tube body to resonate And a second receiving unit (16) for generating a traveling wave traveling from the other end to the one end portion in the driving unit by the resonance.(課題)簡易な方法で移動させることができる、管体に挿入される超音波アクチュエータ等を提供する。(解決手段)一方向に延び、管体の内部に挿入されるコイル状の駆動部(12)と、前記駆動部の一方向の一端部に配置され、前記管体の外部から超音波を受信して共振すると共に、この共振により前記駆動部に一端部から他端部に進む進行波を生じさせる第一受信部(14)と、前記駆動部の一方向の他端部に配置され、前記管体の外部から前記第一受信部が共振する周波数とは異なる周波数の超音波を受信して共振すると共に、この共振により前記駆動部に他端部から一端部に進む進行波を生じさせる第二受信部(16)と、を備える超音波アクチュエータ(10)。
