An endoscope device is provided with: an elongated sheath having an endoscope insertion passage that penetrates therethrough in the longitudinal direction and into which an endoscope is inserted; and a wire that is provided in the sheath and that has a bending portion that bends toward the endoscope insertion passage, wherein the wire has a deforming region that is provided in a distal end portion of the sheath and that deforms between a normal form, in which the deforming region is disposed in the interior of the sheath or along an outer circumferential surface thereof, and a loop-shaped expanded form, in which the bending portion is bended and has a diameter larger than the outer diameter of the sheath.