A connecting structure includes a flat circuit body, a slider that is attached to a vicinity of a distal end portion of the flat circuit body, and a connector which includes a slider containing portion and a terminal arrangement portion. When the slider is connected to the slider containing portion, conductors of the flat circuit body are electrically connected to the connection terminals of the terminal arrangement portion. The slider has a narrow width end portion whose width at the distal end is smaller than width of the flat circuit body so that side edges of the distal end of the flat circuit body are projected from the narrow width end portion. The slider containing portion has a positioning face which contacts with one of the side edges of the distal end of the flat circuit body.