To provide a wire harness protector which does not deteriorate an elastic force of an elastic piece for holding a wire harness and improves endurance of a die to mold the elastic piece.

The wire harness protector 10 has a bottom wall 11, both sidewalls 13 and 13 extended from the bottom wall 11, and a housing recess 15 formed by the bottom wall 11 and both sidewalls 13 and 13. In at least one sidewall 13 of both sidewalls 13 and 13, the elastic piece 20 flexibly formed by a pair of slits 17 and 17 extending toward the bottom wall 11 and a pressing claw 22 extended from a tip of the elastic piece 20 toward an internal portion of the housing recess 15 are formed. An outside face 20a of the elastic piece 20 is the same face as an outside face 13a of the sidewall 13 where the elastic piece 20 is provided. An inside face 20b of the elastic piece 20 is a more drawn face than an inside face 13b of the sidewall 13.