A control method for a robot system, the robot system including: a robot arm driven by an electric motor; an operation control device configured to control the robot arm; and a vehicle that is movable and supports the robot arm, the control method comprising: (a) moving the vehicle to a work station of a first type; and (b) driving the robot arm in the work station of the first type, characterised in that the (a) executes a first operation mode for, in a part of the movement to the work station of the first type, stopping supply of electric power to the electric motor of the robot arm by the operation control device and thus moving the vehicle in a state in which electric power is not supplied to the electric motor of the robot arm, starting supply of the electric power to the electric motor of the robot arm by the operation control device during the movement of the vehicle in the state in which the electric power is not supplied to the electric motor of the robot arm whereby said starting supply of the electric power starts based on determining whether a start condition is satisfied, the start condition being a condition concerning relative positions of the work station at a destination and the vehicle moving along a route to the work station WS at the destination, and arranging the vehicle in the work station of the first type in a state in which the electric power is supplied to the electric motor of the robot arm. a robot arm driven by an electric motor; an operation control device configured to control the robot arm; and a vehicle that is movable and supports the robot arm, the control method comprising: (a) moving the vehicle to a work station of a first type; and (b) driving the robot arm in the work station of the first type, characterised in that (a) moving the vehicle to a work station of a first type; and (b) driving the robot arm in the work station of the first type, characterised in that the (a) executes a first operation mode for, in a part of the movement to the work station of the first type, stopping supply of electric power to the electric motor of the robot arm by the operation control device and thus moving the vehicle in a state in which electric power is not supplied to the electric motor of the robot arm, starting supply of the electric power to the electric motor of the robot arm by the operation control device during the movement of the vehicle in the state in which the electric power is not supplied to the electric motor of the robot arm whereby said starting supply of the electric power starts based on determining whether a start condition is satisfied, the start condition being a condition concerning relative positions of the work station at a destination and the vehicle moving along a route to the work station WS at the destination, and arranging the vehicle in the work station of the first type in a state in which the electric power is supplied to the electric motor of the robot arm. stopping supply of electric power to the electric motor of the robot arm by the operation control device and thus moving the vehicle in a state in which electric power is not supplied to the electric motor of the robot arm, starting supply of the electric power to the electric motor of the robot arm by the operation control device during the movement of the vehicle in the state in which the electric power is not supplied to the electric motor of the robot arm whereby said starting supply of the electric power starts based on determining whether a start condition is satisfied, the start condition being a condition concerning relative positions of the work station at a destination and the vehicle moving along a route to the work station WS at the destination, and arranging the vehicle in the work station of the first type in a state in which the electric power is supplied to the electric motor of the robot arm.