WIRE HARNESS SUPPORT MEMBER, SUPPORT MEMBER-ATTACHED WIRE HARNESS, AND SUPPORT STRUCTURE FOR SUPPORT MEMBER-ATTACHED WIRE HARNESS

A wire harness support member supports a wire harness including a plurality of electrical wires on an attaching target member. The wire harness support member includes: a base attached to the attaching target member while surrounding at least a part of a periphery of the attaching target member; and at least one electrical wire holding member which can be position-adjustably fixed to the base around the attaching target member while holding at least some of the plurality of electrical wires.