PROBLEM TO BE SOLVED: To provide a droplet measuring system, etc. capable of accurately measuring the cubic volume of droplets dropping from a nozzle, which is suitable for mass production.SOLUTION: A droplet measuring system includes: an imaging device for imaging a subject and outputting image data, which is installed so as to bring at least a tip of a nozzle and the whole liquid drooping to the nozzle within its field of view an image forming part 137a for forming images of a state that droplets are dropping from the nozzle in a time-series manner based on the image data output from the imaging device a droplet detection part 137b for detecting a droplet detection image which is an image detecting that droplets have left the nozzle of a plurality of the images formed by the image forming part in a time-series manner and a cubic volume calculation part 137c for calculating the cubic volume of the droplets based on a before-dropping image of the liquid drooping on the nozzle, which is formed a predetermined frame before the droplet detection image of the plurality of images, and a reference image at least of the tip of the nozzle, which is an image different from the before-dropping image.SELECTED DRAWING: Figure 2
