An ultrasonic endoscope having a small size and a slight temperature rise even when the transmission output is increased. The ultrasonic endoscope includes: an ultrasonic transducer part a Peltier element having a cooling surface coupled to the ultrasonic transducer part and a radiating surface a flexing part for supporting the ultrasonic transducer part and the Peltier element a coupling part for coupling the flexing part to an operation part a covering material for covering the flexing part and the coupling part a thermal insulating material provided inside of the covering material, for thermally insulating a part from the radiating surface of the Peltier element to the operation part from outside and a heat-conducting member provided inside of the thermal insulating material and coupled to the radiating surface of the Peltier element, for transferring heat generated in the ultrasonic transducer part to the operation part.
