A vision testing device with an enhanced image clarity for determining good or bad of a testing object by photographing a testing object assembled or mounted during the component assembly process and comparing the photographed image with a previously inputted target image, comprising: a stage part for fixing or transferring the testing object to a testing location; a lighting part for providing lighting to the testing object located on an upper portion of the stage part; a first camera part for obtaining a 2-dimensional image of the testing object located in a center of the lighting part; a plurality of second camera parts (40-2, 40-4, 40-6, 40-8) placed on a side section of the first camera part; a vision processing unit for reading the image photographed by the first camera part and the second camera parts and determining good or bad of the testing object; a control unit for controlling the stage part, the light irradiating parts, and the first and second camera parts; and a light diffusion part formed in the front of the lighting part; characterized by comprising a plurality of grid pattern irradiating parts (50-2, 50-4, 50-6, 50-8) placed between cameras of the second camera parts (40-2, 40-4, 40-6, 40-8); wherein the lighting part comprises a horizontal lighting part, which is located on the upper portion of the stage part, for irradiating the light in a vertical downward direction, and a slope lighting part, which is located on the side of the horizontal lighting part, for irradiating the light in a slope direction; and the light diffusion part is arranged in the front of the horizontal lighting part and the slope lighting part. a stage part for fixing or transferring the testing object to a testing location; a lighting part for providing lighting to the testing object located on an upper portion of the stage part; a first camera part for obtaining a 2-dimensional image of the testing object located in a center of the lighting part; a plurality of second camera parts (40-2, 40-4, 40-6, 40-8) placed on a side section of the first camera part; a vision processing unit for reading the image photographed by the first camera part and the second camera parts and determining good or bad of the testing object; a control unit for controlling the stage part, the light irradiating parts, and the first and second camera parts; and a light diffusion part formed in the front of the lighting part; characterized by comprising a plurality of grid pattern irradiating parts (50-2, 50-4, 50-6, 50-8) placed between cameras of the second camera parts (40-2, 40-4, 40-6, 40-8); wherein the lighting part comprises a horizontal lighting part, which is located on the upper portion of the stage part, for irradiating the light in a vertical downward direction, and a slope lighting part, which is located on the side of the horizontal lighting part, for irradiating the light in a slope direction; and the light diffusion part is arranged in the front of the horizontal lighting part and the slope lighting part. a plurality of grid pattern irradiating parts (50-2, 50-4, 50-6, 50-8) placed between cameras of the second camera parts (40-2, 40-4, 40-6, 40-8); wherein the lighting part comprises a horizontal lighting part, which is located on the upper portion of the stage part, for irradiating the light in a vertical downward direction, and a slope lighting part, which is located on the side of the horizontal lighting part, for irradiating the light in a slope direction; and the light diffusion part is arranged in the front of the horizontal lighting part and the slope lighting part.