In the present invention, a terminal connection structure is provided with a male terminal and a female terminal that has elasticity and fits the male terminal so as to sandwich the male terminal from both sides. The male terminal includes the following: a base material; a first ground layer covered by the base material; a second ground layer covered by the first ground layer; and an outermost layer covered by the second ground layer. The first ground layer and the second ground layer each have a different hardness.