This automatic setting device for automatically setting control devices for a plurality of ship propulsion apparatuses for generating ship propulsion forces is provided with: an input operation setting unit that sets an input operation for a ship; a target behavior acquisition unit that acquires a target behavior of the ship corresponding to the input operation set by the input operation setting unit; a ship information acquisition unit that acquires ship information about the position and/or the bearing of the ship; an actual behavior calculation unit that calculates the actual behavior of the ship on the basis of the ship information acquired by the ship information acquisition unit; and a propulsion force setting unit that sets the magnitudes and the directions of the propulsion forces generated by the respective ship propulsion apparatuses on the basis of the actual behavior of the ship acquired by the actual behavior calculation unit and the target behavior of the ship acquired by the target behavior acquisition unit.