PURPOSE: To provide the irradiation device for exerting a satisfactory influence biochemically on a medical treatment of the human body, etc., or with respect to animals and plants, etc.

CONSTITUTION: In the case an electromagnet 2 being a magnetic fore generating device is connected to a circuit by a switch 7a, a voltage is applied to the electromagnet 2 by a repeat pattern of a cycle in which a peak point is constant and a bottom point descends successively by adding a V-shaped voltage signal 6e and a step shape voltage signal 6f of a descending pattern, and an object is irradiated with magnetic force of strength and a pattern corresponding thereto. On the other hand, when a light emitting device 3 being a light generating device is selected by the switch 7a, a voltage is applied to the light emitting device 3 by a repeat pattern of a cycle in which the peak point is constant and the bottom point ascends successively by adding the V-shaped voltage signal 6e and a step type voltage signal 6f' of an ascending pattern, and the object is irradiated with light of strength and a pattern corresponding thereto.