To provide a medicinal composition for treating cancer, via a mechanism of activating immunity by inhibiting immunosuppression mediated by Treg cells or the like.SOLUTION: There is provided a medicine for treating cancer, the composition comprising a combination of an antibody against CCR8 and an anti-PD-1 antibody or an anti-PD-L1 antibody.SELECTED DRAWING: None【課題】Treg細胞等による免疫抑制を阻害することにより免疫を賦活させる機構を介した、癌治療のための医薬組成物の提供。【解決手段】CCR8に対する抗体、及び抗PD-1抗体又は抗PD-L1抗体を組み合わせてなる癌治療用の医薬。【選択図】なし