A laser beam irradiation device according to the present invention is equipped with very strict safety means, thereby assuring that a user can use it safely.
A hand-held applicator has a face H formed on its top, and a push button switch S4 on its side. The face H has a spherical lens 31 press-fitted in its center hole, and the face H has a hollow cylinder 32 integrally connected to its circumference, encircling the spherical lens 31. The hand-held applicator is applied to one's skin by the hollow cylinder 32 at its edge.
The hollow cylinder 32 has a cylindrical electrode 33 embedded in and somewhat projecting forward. A heat sink 34 is placed behind the spherical lens 31, and a semiconductor laser diode 35 is press-fitted in the through hole, which is made in the center of the heat sink 34.
A cooling fan 36 is placed behind the heat sink 34.