ANOMALY DETECTION DEVICE, ANOMALY DETECTION METHOD AND ANOMALY DETECTION SYSTEM

This anomaly detection device 1 comprises: an acquisition unit 141 which acquires a correction amount of a fuel injection amount of each of multiple cylinders 25 while an engine 21 is in a prescribedstate; a storage unit 13 which associates the multiple correction amounts acquired by the acquisition unit 141 with each of the cylinders 25 and stores these in time series; and a determination unit 142 which, on the basis of the change pattern of the multiple correction amounts, determines whether or not an anomaly has occurred in any of the cylinders 25. 异常检测装置(1)具有：取得部(141)，其取得引擎(21)为预定的状态期间的多个汽缸(25)各自的燃料喷射量的修正量；存储部(13)，其将取得部(141)所取得的多个修正量与各汽缸(25)相关联，并按时间顺序存储；以及判定部(142)，其基于多个修正量的变化模式来判定在多个汽缸(25)中的任何个上是否发生了异常。