An insertion instrument and an endoscope are provided that include: a bending portion provided in an insertion portion a flexible tube portion connected in series to a proximal end side of the bending portion an inside guide pipe provided inside the insertion portion, and inside which a wire is inserted to freely advance and retract and an outside guide pipe provided inside the insertion portion, and inside which the inside guide pipe is inserted to freely advance and retract. Inside the insertion portion, a distal end of the inside guide pipe is fixed to a midway position of the bending portion, and a proximal end of the inside guide pipe is configured to be switchable between a fixed state and a non-fixed state. Further, inside the insertion portion, a distal end of the outside guide pipe is fixed to a distal end of a flexible tube portion, and a proximal end thereof is fixed at a more rearward position than the flexible tube portion.
