An ultrasound endoscope comprises an ultrasonic probe where a plurality of ultrasonic transducer elements for transmitting/receiving ultrasounds are arranged in a nearly cylindrical form, a distal rigid section which configures the tip of an endoscopic insertion tube and in which the ultrasonic probe is provided, a bending tube to which the distal rigid section is connected and which bends with remote operation, a flexible tube connected to the bending tube, and a signal line bundle which is a bundle of signal lines corresponding to respective ultrasonic transducer elements for transmitting a drive signal driving each of the ultrasonic transducer elements and which passes through the insides of the distal rigid section, the bending tube, and the flexible tube. The signal line bundle is covered with a binding member for binding the signal line bundle, and the binding force of the binding member which covers an area of the signal line bundle in a predetermined range in the signal line bundle included in the bending tube is made smaller than the binding force of the binding member which covers the signal line bundle in areas other than the predetermined range.