Abstract: A foreign substance analysis system capable of accurately and easily analyzing a foreign substance contained in a sample. The foreign substance analysis system includes an infrared spectrum acquisition step of acquiring infrared spectrum information of a sample measured by an infrared spectrophotometer; and a fluorescent X-ray spectrum acquisition step of acquiring fluorescent X-ray spectrum information of the sample measured by a fluorescent X-ray analyzer; and a determination step of determining whether or not an organic element is contained in the sample by comparing a ratio of an intensity of a Compton scattered ray and an intensity of a Rayleigh scattered ray in the fluorescent X-ray spectrum information with a set threshold value.