A wiring holding unit for holding a tubular receiving member receiving wiring therein includes a gripping member including a pair of gripping portions for gripping the receiving member, and a movable portion interconnecting the pair of gripping portions such that the pair of gripping portions are movable, and a fitting/fixing member which is separate from the gripping member, and is moved toward the gripping member in a direction generally perpendicular to a direction of fixing of the receiving member gripped by the gripping member, and is fitted on the gripping member to be fixed thereto, thereby preventing the pair of gripping portions from moving respectively in directions opposite respectively to gripping directions of the pair of gripping portions.