An endoscope has an insertion portion, an abutment portion, increasing means and observation means. The insertion portion is an insertion portion which can be inserted into a subject. The abutment portion is provided at a distal end portion of the insertion portion. The abutment portion provided at the distal end portion can contact with the subject. The increasing means increases the abutment area of the abutment portion. The observation means performs observation of the subject on the abutment portion provided at the distal end portion and having been increased by the increasing means, or performs observation of the subject spaced by a predetermined distance by the increased abutment portion.
