This endoscope is provide with an insertion part provided with an insertion body, and an attachment unit that is disposed in the outer circumferential direction of the insertion part, and that is capable of rotating around a longitudinal axis relative to the insertion body. The attachment unit is provided with: a tube body that extends along the longitudinal axis in a state in which a gap exists between the attachment unit and an outer circumferential section of the insertion part or a member attached to the outer circumferential section of the insertion part a fin part that extends in a helical shape along the longitudinal axis on an outer circumferential section of the tube body and a tube leading end that is disposed in the proximal direction from the tip of the attachment unit, and is formed from a material that is softer than the tube body. The tube leading end is provided with tip-side gap reduction section for eliminating the gap or reducing the gap between the attachment unit and the outer circumferential section of the insertion part or a member attached to the outer circumferential section of the insertion part, from a location in the inner circumferential direction of the tube body.Linvention porte sur un endoscope qui comporte une partie dintroduction comportant un corps dintroduction, et une unité de fixation qui est disposée dans la direction circonférentielle externe de la partie dintroduction, et qui est apte à tourner autour dun axe longitudinal par rapport au corps dintroduction. Lunité de fixation comporte : un corps de tube qui sétend le long de laxe longitudinal dans un état dans lequel un espace existe entre lunité de fixation et une section circonférentielle externe de la partie dintroduction ou un élément fixé à la section circonférentielle externe de la partie dintroduction une partie dailette qui sétend selon une forme hélicoïdale le long de laxe longitudinal sur une section circonférentielle externe du corps de tube et une extrémité avan
