Ultrasound endoscope

An ultrasound endoscope including a cable for connecting the ultrasound endoscope to a driving apparatus, the ultrasound endoscope comprising:

• an insertion section insertable into a subject;
• a distal end portion located at a distal end of the insertion section and including a curved surface in at least a part of a cylindrical surface shape;
• a plurality of transducers provided at the distal end portion and arrayed in a surface shape on the curved surface to configure one array surface;
• an electrode formed in each of the transducers;
• a wiring section connected to the electrode to electrically connect the electrode and the cable;
• and
• matching circuits, at least one of which is provided at an end of or partway in the wiring section, provided with an electric circuit including a capacitor or an inductor, wherein
• the electrode, the wiring section, and the matching circuits are provided in each of the plurality of transducers, and, concerning at least one of the matching circuits, the matching circuit is disposed in the distal end portion such that relative positions of the matching circuit and a transducer to which the matching circuit is connected are different from relative positions of another matching circuit and another transducer to which the other matching circuit is connected, and
• the cable includes a core wire and an insulating layer enwrapping the core wire and functions as a matching section that matches electric impedance of each of the transducers between the plurality of transducers and the driving apparatus by varying a thickness or quality of material of the insulating layer, respectively.