A multi-core cable 1 includes plural shielded electric wires 10 for signal transmission. The plural shielded electric wires 10 are bundled so as to make contact with the adjacent shielded electric wires 10, and sheaths 14 of the plural shielded electric wires 10 are respectively removed at the same position in the length direction, and outer conductors 13 of the plural shielded electric wires 10 at the position at which the sheaths 14 are removed are bundled by a metal wire 30 and the bundled portion is soldered and fastened.