It is an insertion path securing apparatus for guiding an insertion instrument to be inserted into a body-cavity, by an insertion portion having a longitudinal axis. The insertion path securing apparatus includes a first bending member configured to be bendable by operating a first bending operation portion, a second bending member configured to be bendable at a position differing from that of the first bending member by operating a second bending operation member, and a hardness changing member. A hardness variable portion of the hardness changing member can change hardness between a flexible state in which flexibility, with which the insertion portion is bendable by the first or second bending member, is given to the insertion portion by operating the hardness changing operation portion, and a rigid state in which a curved shape given to the insertion portion by the first and second bending members is maintained.
