PURPOSE: To improve analyzing accuracy and to obtain emission spectrochemical analysis method of steel using laser, which can be used in an adverse environment, by inputting light having sufficient intensity, which is excited by laser light, into a spectroscope, and also utilizing other methods for improving accuracy.

CONSTITUTION: A laser oscillator 22 is controlled by a switching circuit 24. Infrared-ray pulse laser light A is projected on the surface of a sample 10 from the laser oscillator 22 so that energy density becomes 2.0×109W/mm2 or more. Excited and discharged light B is converged to a mirror 12 at a solid cubic angle 16° in a light guiding system in a case 18 through a path wherein an inactive gas atmosphere is maintained. The image of the light is formed at an input slit 16A of a spectroscope 16. The light, which has passed the slit 16A, is dispersed by a lattice 16B. The initial emitted light, which generates white noises, is eliminated. by using the following emitted light, the ratio of spectral intensities is computed by a signal processing part 32. The concentration of an element to be measured is computed based on a calibration curve, which is prepared by using a standard sample beforehand. The result is displayed on a display part 34.