A method for crimping terminals of an electric wire includes conveying an electric wire from one side of a plurality of electric wire crimping units to another side allocated in a row in a conveying direction of the electric wire, without the electric wire being grip-substituted. The method also includes crimping the terminal by stopping conveyance of the electric wire at a discretional one of the plurality of electric wire crimping units. The method also includes the following steps carried out in this order: measuring the electric wire and cutting the electric wire in a predetermined length; stripping a jacket at both ends of the electric wire; crimping the terminal to an end of the electric wire; regulating a position of the terminal of the terminal-attached electric wire; and inserting the terminal-attached electric wire to a connector housing.