To allow a missile to meet a target by switching an angle of elevation generation control device with a side thruster control device according to the flying altitude of the missile to enable the turning irrespective of the air density.

An angle of elevation generation control device 18a is switched with a side thruster control device 26a according to the altitude of a self position plotting device 13 by constantly operating a middle stage guide device and a turning means switching device during the turning in the final guide stage. At the switching instant, a central processing unit 14 operates a rocket separation device 28 to separate an acceleration rocket of a missile 2b. The period to achieve the ballistic flight of the missile 2b is set by a free ballistic device 29 before the missile is launched so that the forces such as the thrust and the lift are not exerted in the ballistic flight stage.