To make a wiring/piping protection member applicable to a plurality of kinds of wiring/piping members, and to make small the inside diameter of a passing hole into which the wiring/piping protection member is inserted and fitted.

The circumferential wall body 1 of the protection member A1 is divided into four circumferential wall blocks 2a, 2b, 2c and 2d, by providing first and second hinges H1, H2 at positions that divide the circumferential wall body 1 almost equally in the circumferential direction on the circumferential wall body 1, in which a split V is formed along its axial direction and which corresponds to the outside diameter of a pipe P1 in a reduced-diameter state. The inside diameter d1 of a passing hole B1 formed in a wall building member S is made smaller by reducing the diameter at the fulcrum of a first hinge H1 provided at a position facing the split V when protecting the pipe P1, by reducing the diameter of each circumferential wall blocks 2a, 2b, 2c and 2d at the fulcrums of the first and second hinges H1, H2, and by making the outside circumferential shape of the circumferential wall body 1 nearly circular after reducing the diameter, when protecting a pipe P2, which is smaller than the pipe P1 in diameter.