A support member is for supporting a conductive member such as an electrical wire and is for installation in an automatic transmission, and includes a main body portion made of a resin and plates that are made of a metal and are to be fixed to the body of the automatic transmission via bolts. The main body portion has attachment portions to which the plates are attached, and elastic lock portions that project within the attachment portions and have elasticity capable of restricting removal of the plates from the attachment portions.