PROBLEM TO BE SOLVED: To provide a new pyrimidine derivative which is useful as a pest controlling agent.SOLUTION: The new pyrimidine derivative represented by formula [I] is useful as a pest controlling agent.【課題】有害生物防除剤として有用な新規ピリミジン誘導体の提供。【解決手段】下記の新規ピリミジン誘導体は、有害生物防除剤として有用である。次式[I]:【選択図】なし