Disclosed is a dihydropyrimidine fused ring derivative as an HBV inhibitor. The present invention specifically provides a compound represented by formula (I) or a pharmaceutically acceptable salt thereof. [Chemical 1] [Selected figure] None【課題】HBV阻害剤としてのジヒドロピリミジン縮環誘導体の提供。【解決手段】本発明は、具体的に、式(I)に示す化合物又はその薬学的に許容される塩を提供する。【化1】【選択図】無