A wiring module production plant includes a rotatable support supported so as to be capable of rotating and having N stages (where N is an integer equal to or greater than two) on which an object (such as a base wiring module and a bracket) involved in production of the wiring module can be arranged, the stages being provided corresponding to each of N positions having N-fold rotational symmetry. N stations are provided so as to respectively correspond to each of the N positions having N-fold rotational symmetry centered around a rotation axis of the rotatable support. The N stations include a manual work station which allows manual work to be performed on the object, and a mechanical work station which allows mechanical work to be performed on the object.