PROBLEM TO BE SOLVED: To provide an endoscope apparatus which reliably and easily performs work to fix a tube body to an end hard member or the like while securing water-tightness in a short time.SOLUTION: An endoscope apparatus includes: a curved rubber disposition recess 71 which is provided on the surface in a projective manner and is provided in an end hard member that constitutes an insertion part having a contact slope 75 and a distal end side side surface 74 facing each other in a longitudinal axis direction a tube body which is flexible, formed into a tube, and includes the curved rubber disposition recess 71 an energization part which protrudes from an inner peripheral surface of the tube body in a center axis direction, is in contact with the contact slope 75, is deformed in the longitudinal axis direction, and imparts a pressing force to the contact slope 75 and a distal end side engaging recessed surface which is provided in the inner peripheral surface of tube body, is in contact with the distal end side side surface 74 when the tube body moves in the longitudinal axis direction with respect to the curved rubber disposition recess 71 by a pressing force, and engages the tube body with the curved rubber disposition recess 71.
