A puncture apparatus according to the present disclosure comprises: a needle member having a tubular shape, the needle member including a flexible portion that is deformable； and a puncture assisting member being movable or deformable in an axial direction of the needle member between a restricting position and a permissive position, the restricting position being a position outside the flexible portion of the needle member in a radial direction of the needle member and restricting deformation of the flexible portion, the permissive position being a position not outside the flexible portion in the radial direction and permitting deformation of the flexible portion, wherein the puncture assisting member is configured to move or deform from the restricting position to the permissive position in conjunction with an operation of inserting the flexible portion into a living body at the time of puncturing the needle member.
