An insertion instrument and an endoscope are provided that include: a bending portion 7 provided in an insertion portion 4 a flexible tube portion 8 connected in series to a proximal end side of the bending portion 7 an inside guide pipe 40 provided inside the insertion portion 4, and inside which a wire is inserted to freely advance and retract and an outside guide pipe 50 provided inside the insertion portion 4, and inside which the inside guide pipe 40 is inserted to freely advance and retract. Inside the insertion portion 4, a distal end 40s of the inside guide pipe 40 is fixed to a midway position of the bending portion 7, and a proximal end 40k of the inside guide pipe 40 is configured to be switchable between a fixed state and a non-fixed state. Further, inside the insertion portion 4, a distal end 50s of the outside guide pipe 50 is fixed to a distal end of a flexible tube portion 8, and a proximal end 50k thereof is fixed at a more rearward position than the flexible tube portion 8.
