An ultrasound endoscope includes an objective optical system, an illumination optical system, a distal end portion, an ultrasound transducer portion, a distal end cover, a through-hole formed in the distal end cover, a conductor wire portion, and a conductor wire portion passing portion formed in the distal end cover and configured to communicate with the through-hole and reach an outer circumference of the distal end cover, the conductor wire portion passing portion forming a region where the conductor wire portion passes from the through-hole to an outside of the distal end cover member when the ultrasound transducer portion is detached from the distal end portion.
