A cable connection structure includes a substrate and a coaxial cable connected to the substrate. The coaxial cable has: a conductor; an inner insulator that coats an outer periphery of the conductor; a shield that coats an outer periphery of the inner insulator; and an outer insulator that coats an outer periphery of the shield. The substrate has: a plate-shaped insulating base material; a conductor connection electrode to which the conductor is connected; and a shield connection electrode to which the shield is connected. A ground is provided on a back surface of the base material opposite to where the conductor connection electrode is formed. The shield connection electrode is an exposed portion of the ground. At a connection part of the substrate to which the coaxial cable is connected, the shield connection electrode, the base material, and the conductor connection electrode are bared in a stepwise fashion.