A microparticle measuring system includes a light source, an objective lens, an imaging lens, an image sensor, and an information processing unit. The light source emits illumination light to liquid including a microparticle to be measured. The objective lens condenses the illumination light. The imaging lens forms an image of the illumination light. The image sensor captures the image of the illumination light and outputs a captured image. The information processing unit detects the microparticle appearing in the captured image, calculates detection accuracy of microparticle detection based on the detected microparticle and a predetermined index, and determines next processing based on the calculated detection accuracy of microparticle and preset target accuracy.