A wire splicing method including: disposing a tape-like first wire and a tape-like second wire in a holding base so that an end portion of the first wire and an end portion of the second wire face each other; disposing solder to straddle the first wire and the second wire; disposing a connection wire on the solder; pressing a heating body to the first wire, the second wire, and the connection wire via a pressing plate, and pressing together and heating the first wire, the second wire, and the connection wire so as to melt the solder; keeping the first wire, the second wire, and the connection wire pressed together by the pressing plate; separating the heating body from the pressing plate; and cooling the pressing plate to solidify the solder, and thereby connecting the first wire and the second wire together.