Provided is an anti-PD-L1 antibody that can be frequently administered to animals other than rats. The anti-PD-L1 antibody contains (a) an L-chain and (b) an H-chain. Said L-chain has: an L-chain-variable region including CDR1 that has the amino acid sequence QSLLYSENQKDY (SEQ ID NO: 37), CDR2 that has the amino acid sequence WAT, and CDR3 that has the amino acid sequence GQYLVYPFT (SEQ ID NO: 38)； and an L-chain-constant region of an antibody of an animal other than a rat. Said H-chain has: an H-chain-variable region including CDR1 that has the amino acid sequence GYTFTSNF (SEQ ID NO: 39), CDR2 that has the amino acid sequence IYPEYGNT (SEQ ID NO: 40), and CDR3 that has the amino acid sequence ASEEAVISLVY (SEQ ID NO: 41)； and an H-chain-constant region of an antibody of an animal other than a rat. A pharmaceutical composition comprising the anti-PD-L1 antibody as an active ingredient. A method of producing the anti-PD-L1 antibody is also provided.
