An ultrasound endoscope having a rigid portion (11) provided at a distal end side of an insertion portion, an ultrasound probe (21) that is provided at the rigid portion (11), and transmits and receives ultrasound signals, a cable (27) that transmits electrical signals that are inputted to and outputted from the ultrasound probe (21), and a rigid flexible substrate (24) that is interposed between the ultrasound probe (21) and the cable (27) to transmit the electrical signals, and configures a part of a planar member in which a plurality of layers including a wiring layer are stacked as a flexible portion (25) further including an insulating layer, and the other portion as a rigid portion (26) further including a rigid layer, wherein the ultrasound probe (21) is connected to the rigid portion (26), and at least a part of the flexible portion (25) is disposed in a spiral shape to surround a wiring connection portion of the cable (27) and the rigid flexible substrate (24).
