When batteries of a plurality of electric autonomous moving bodies are charged, a plurality of electric autonomous moving bodies are aligned in a serial state, a second connection means of one of the electric autonomous moving bodies that are adjacent to each other in a direction in which the electric autonomous moving bodies are aligned and a first connection means of the other one of the electric autonomous moving bodies that are adjacent to each other are electrically connected to each other, and the first connection means of the electric autonomous moving body that is the closest to the charger unit and the connection means of the charger unit are electrically connected to each other. In this case, power is supplied from the charger unit to each of the electric autonomous moving bodies, thereby charging the batteries of the plurality of electric autonomous moving bodies.