Aluminum-based terminal fitting, and terminal connection structure for electric wires

The terminal fitting (10) includes a conductor connecting portion where the conductor (210) is connected consisting of an aluminum or aluminum alloy comprising a wire (200) and (wire barrel portion (11)), another terminal fitting (male terminal fitting comprising (100M)) part of (male fitting portion (140)) engaging and mating portion electrically connecting the (13). The fitting portion (13) is extended to the conductor connection portion, a cylindrical box portion which is molded by plastic working (14) is arranged inside the box section (14), male fitting by the biasing force It comprises elastic piece contacting the part (140) and (15, 16). The terminal fitting (10) includes an aluminum alloy constituting the box portion (14), the junction region and the aluminum alloy are joined to constitute at least a part of the elastic piece (15, 16). Aluminum alloy constituting the elastic piece (15, 16), when the high tensile strength than the box section (14), hardly stress relaxation. The box portion (14) is excellent in moldability because of its relatively low intensity.