PROBLEM TO BE SOLVED: To provide an abnormality determination system that can determine an abnormality degree in a poultry house.SOLUTION: An abnormality determination system 10 includes: a measurement part 31 for measuring surface temperatures of head parts of a plurality of chickens in a poultry house 100； a determination part 21a for determining an abnormality degree of the plurality of chickens based on the surface temperatures of the head parts of the plurality of chickens measured by the measurement part 31； and an output part 21b for outputting information indicating the abnormality degree determined by the determination part 21a.SELECTED DRAWING: Figure 2【課題】鶏舎内の異常度を判定することができる異常判定システムを提供する。【解決手段】異常判定システム１０は、鶏舎１００内の複数の鶏の頭部の表面温度を計測する計測部３１と、計測部３１によって計測された複数の鶏の頭部の表面温度に基づいて、複数の鶏の異常度を判定する判定部２１ａと、判定部２１ａによって判定された異常度を示す情報を出力する出力部２１ｂとを備える。【選択図】図２
