A device for counting the number of micro particles, which comprises: a sample chip having an upper substrate and a lower substrate and a reading part which is formed with a predetermined height and a predetermined width in the space between the upper and lower substrates, wherein the reading-part is divided into sub-areas, wherein a sample containing particles may be located at the reading part; a light source adapted to project light into a sub-area on the sample chip; an object lens facing to the chip adapted to magnify the image of the sample that is formed on the sub-area by the light illuminated from the light source; an image photographing part adapted to photograph the image of the sample, which is magnified by the object lens, in a sub-area on the sample chip, a micro particle counting part adapted to count micro particles on the sub-area from the image photographed by the image photographing part, and a chip shifter adapted to shift the position of the sample chip in order that a certain area adjacent to the area photographed just before is shifted to the point where the light is incident, wherein the chip shifter is adapted to shift the sample chip by a predetermined distance at every predetermined time interval, and the image photographing part being adapted to subsequently photograph the image of a certain sub-area adjacent to the sub-area photographed just before as the sample chip is shifted, wherein the micro particle counting part is adapted to count micro particles in the sub-area successively photographed by the image photographing part, to add the number of micro particles in each sub-area together, and to calculate the total number of micro particles in the sample, and to then, calculate the average density of the micro particles from the total volume of the reading part of the sample chip and the total number of the microparticles. a sample chip having an upper substrate and a lower substrate and a reading part which is formed with a predetermined height and a predetermined width in the space between the upper and lower substrates, wherein the reading-part is divided into sub-areas, wherein a sample containing particles may be located at the reading part; a light source adapted to project light into a sub-area on the sample chip; an object lens facing to the chip adapted to magnify the image of the sample that is formed on the sub-area by the light illuminated from the light source; an image photographing part adapted to photograph the image of the sample, which is magnified by the object lens, in a sub-area on the sample chip, a micro particle counting part adapted to count micro particles on the sub-area from the image photographed by the image photographing part, and a chip shifter adapted to shift the position of the sample chip in order that a certain area adjacent to the area photographed just before is shifted to the point where the light is incident, wherein the chip shifter is adapted to shift the sample chip by a predetermined distance at every predetermined time interval, and the image photographing part being adapted to subsequently photograph the image of a certain sub-area adjacent to the sub-area photographed just before as the sample chip is shifted, wherein the micro particle counting part is adapted to count micro particles in the sub-area successively photographed by the image photographing part, to add the number of micro particles in each sub-area together, and to calculate the total number of micro particles in the sample, and to then, calculate the average density of the micro particles from the total volume of the reading part of the sample chip and the total number of the microparticles.