A production system includes a production facility and a portable operation terminal connectable to the production facility through a wireless communication. A connection state is brought between the production facility and the portable operation terminal by sending a connection request signal for a connection request to the production facility from the portable operation terminal, and sending a connection permission signal for responding to the connection request signal to the portable operation terminal from the production facility according to a predetermined condition, and it is permitted that the operation input to a control processing portion of the production facility from the portable operation terminal in the connection state.