An insertion apparatus includes a moving unit moving between a first movement position in a state that a motion portion performs a motion and a second movement position in a state that the motion of the motion portion is regulated. A link unit oh the insertion apparatus includes a coupling portion which couples a first link with a second link in a state that the first link and the second link form a substantially V-like shape having a link coupling position as an apex when the moving unit is placed at the first movement position and in a state that the first link and the second link form a substantially linear shape that does not bend at the link coupling position when the moving unit is placed at the second movement position.
