Patent ID: 8753263

Claim:
An insertion apparatus comprising: an insertion section which includes a motion portion at a distal end portion thereof, and which is extended along a longitudinal axis; a holding section which is provided to a proximal direction side of the insertion section; a transmitting portion configured to transmit, to the motion portion, input of an operation of performing a motion in the motion portion; an interlocking movement member configured to move along the longitudinal axis with respect to the holding section in tandem with the motion of the motion portion; a switching operating section which is configured to perform a switching operation of a state of the motion portion between a state that the motion portion performs the motion in response to the input of the operation and a state that the motion of the motion portion is regulated irrespective of the input of the operation; a moving unit which is configured to move in accordance with the switching operation between a first movement position in the state that the motion portion performs the motion and a second movement position in the state that the motion of the motion portion is regulated; a link unit including: a first link; a second link which is attached to the first link at a link coupling position; and a coupling portion which couples the first link with the second link to allow their pivotal movement with respect to each other about the link coupling position in a state that the first link and the second link form a substantially V-like shape having the 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; and a regulating portion which configured to regulate movement of the interlocking movement member along the longitudinal axis, and configured to fix and hold the motion portion when the first link and the second link of the link unit form the substantially linear shape.