The insertion apparatus includes: a linearly-extending insertion section main body 41 an outer tube 43 covering the outer circumference of the insertion section main body 41 and an annular band member 44 provided on the outer tube 43 in such a manner as to meander on an imaginary circle 46 on the outer tube 43 whose center is the same as the central axis of the insertion section main body 41. The annular band member 44 is configured to shrink in the direction along the imaginary circle and thereby secure the outer tube 43 to the insertion section main body 41.
