Provided is an anti-PD-1 antibody that can be administered frequently even to animals other than rats. An anti-PD-1 antibody including: (a) an L chain that has an L chain variable region including CDR1 having the amino acid sequence of QSLEYSDGYTY (SEQ ID NO: 16), CDR2 having the amino acid sequence of GVS, and CDR3 having the amino acid sequence of FQATHDPDT (SEQ ID NO: 17), and also has an L chain constant region of an animal antibody other than rat； and (b) an H chain that has an H chain variable region including CDR1 having the amino acid sequence of GFSLTSYY (SEQ ID NO: 18), CDR2 having the amino acid sequence of IRSGGST (SEQ ID NO: 19), and CDR3 having the amino acid sequence of ARTSSGYEGGFDY (SEQ ID NO: 20), and also has an H chain constant region of an animal antibody other than rat. A pharmaceutical composition containing the anti-PD-1 antibody as an active ingredient. Also provided is a method for producing the anti-PD-1 antibody.
