A cable holding member includes a stopper member and a housing. The stopper member has an attachment surface for supporting a flat cable in a folded state. The housing has a mounting surface which is provided at an opening edge of a housing space for housing the stopper member and on which the flat cable is to be placed, and recesses into which protrusions of the flat cable placed on the mounting surface are to be fitted. The flat cable is placed on the mounting surface, and then, the stopper member is inserted into the housing space of the housing. In this way, the stopper member is attached to the housing with the flat cable being supported on the attachment surface.