An insertion assist information detection system (1) includes an endoscope apparatus which includes an insertion portion (12) to be inserted into a tube, a grasp portion (11) which is grasped by an operator, and a movable portion (13) which mechanically connects the insertion portion (12) and the grasp portion (11) to relatively move the insertion portion (12) and the grasp portion (11)； and a movement amount detection sensor (50) which detects a relative movement amount of the insertion portion (12) and the grasp portion (11) in the movable portion.
