A wiring fixing member for fixing a receiving member, receiving wiring therein, to a mating member includes a base portion, a pair of holdingwalls which are formed on and project upwardly from the base portion, and can hold the receiving member therebetween in a manner to position the receiving member, and a pair of retaining portions which extend respectively from the pair of holding walls, and can retain the receiving member held by the pair of holding walls, the pair of retaining portions defining an opening therebetween which intersects a longitudinal direction of the receiving member, held by the pair of holding walls, at an acute angle.