PURPOSE: To provide a layout controlling jig by restricting the cable layout to a predetermined arrangement for a wiring unit thereby accurately and efficiently processing the wiring unit for the prefabrication of indoor wiring.

CONSTITUTION: A plurality of guide pins 3 are arranged upright at the intervals through which cables C can pass. This layout controlling jigs 1 are arranged at proper intervals on a working base 13, and the wiring unit can be processed while restricting the cable layout to the predetermined arrangement.