PROBLEM TO BE SOLVED: To easily improve the detection accuracy of the temperature of a vibrator. A transducer 1 includes a vibrator 11, a support portion 7, and a temperature sensor 12. The vibrator 11 transmits an elastic wave or receives a reflected wave based on the elastic wave. The support portion 7 supports the vibrator 11. At least a part of the temperature sensor 12 is arranged at a position overlapping the heat insulating layer 8 having a lower thermal conductivity than that of the support portion 7 in the one direction D1 in which the vibrator 11 and the support portion 7 are arranged, and Detect. [Selection diagram] Figure 1【課題】振動子の温度の検知精度を向上しやすくすること。【解決手段】トランスデューサ１は、振動子１１と、支持部７と、温度センサ１２と、を備える。振動子１１は、弾性波を送波する又は弾性波に基づく反射波を受波する。支持部７は、振動子１１を支持する。温度センサ１２は、振動子１１と支持部７とが並ぶ一方向Ｄ１において、支持部７よりも熱伝導率が低い断熱層８と重なる位置に少なくとも一部が配置され、振動子１１の温度を検知する。【選択図】図１
