ULTRASOUND ENDOSCOPE

Provided is an ultrasound endoscope comprising: an insertion part to be inserted into a subject; an ultrasound oscillator disposed on the leading end of the insertion part and comprising a plurality of piezoelectric element groups for transmitting and receiving ultrasound; a connector part disposed on the base end side of the insertion part and comprising a plurality of connectors to be connectedto an external device; an instrument channel for allowing an instrument passed through from the base end side of the insertion part to protrude from a forceps aperture disposed on the base end side ofthe ultrasound oscillator; and a cable part wherein at least one coax line of a coax line group connected to the piezoelectric element group transmitting the ultrasound in a region wherethrough the instrument protruding from the foreceps aperture is highly likely to pass is shorter than a coax line connected to the piezoelectric element group transmitting the ultrasound in a region wherethrough the instrument protruding f