An endoscope system includes, an insertion section a distal structure portion provided at a distal end of the insertion section a pivot base an elongated pulling member connected to the pivot base a tubular elastic member configured to cover the pulling member a cylindrical cover configured to be attached to the distal structure portion, and including an opening portion a cover removing tool configured to be capable of pushing an edge of the opening portion, in a state in which the cover removing tool is engaged with the cover and a projection provided on the cover removing tool, the projection being configured to come in contact with the edge of the opening portion at a position apart from a position of the one end of the elastic member.
