A supporting member is a supporting member for attaching a plurality of electrical wires to an attaching target member. The supporting member includes a plurality of electrical wire holding members each including an electrical wire holding part which can hold at least a part of an electrical wire and a connection part integrally formed with the electrical wire holding part. The plurality of electrical wire holding members are parallelly connected by the connection parts so that the plurality of electrical wires to be held by the electrical wire holding parts are parallel to each other.