To provide a power source harness-connecting structure for an implement-linking device which allows a power source harness to be automatically attached or detached and is capable of preventing harness terminals on a linking frame side from contacting with each other.

The power source harness-connecting structure for an implement-linking device is obtained by installing male connectors and female connectors capable of fitting with the male connectors to the harness at the linking frame side and the harness at the implement side so as to oppose each other, respectively, and fitting the male connectors respectively to the female connectors in association with each other, when the linking frame and the implement come to a linking position. One couple of the opposing male connector and female connector, and the other couple of the opposing male connector and female connector are arranged in the linking frame and the implement, and a terminal for connection is installed in each of the male connectors and the female connectors, respectively. One terminal of a male side terminal or the female side terminal comprises holding pieces expandable by elastic deformation, while another terminal is formed in the shape of a stick which inner-fitted freely inserted or extracted between the holding pieces of the one terminal concerned.