An ultrasound endoscope includes: an acoustic lens for transmitting/receiving ultrasound； a transducer element generating ultrasound vibration transmitted/received via the acoustic lens； backing material with an insulation property provided on a face of the transducer element opposite to the acoustic lens； a housing accommodating the acoustic lens, the transducer element and the backing material so as to expose a surface of the acoustic lens to an outside； an insulative cooling portion with thermal conductivity higher than thermal conductivity of the backing material, and laminated on a surface of the backing material opposite to a surface in contact with the transducer element； and a signal wire configured with a metal wire extended from the transducer element into the housing through the backing material, the signal wire, including a curved portion curved so that an area of contact with the cooling portion is increased, being covered with the cooling portion.
