A distal cover being attached to a distal configuration portion provided on a distal side of an insertion section to be inserted into a body, a ring-shaped first cover which is made of an insulating material and which has a lock portion that is removably locked to the distal configuration portion； and a ring-shaped second cover which is made of an insulating material that is more flexible than the first cover and which is provided more on a proximal side than the first cover.
