Provided is a stable pharmaceutical composition comprising a PEGylated Fab' fragment of an anti-human NGF antibody, capable of inhibiting the formation of degradation products, multimers, acidic related substances, basic related substances, and insoluble foreign substances. The pharmaceutical composition has a pH of 4 to 5.5, and can further comprise a pharmaceutically acceptable buffer, a pharmaceutically acceptable isotonizing agent, and a pharmaceutically acceptable surfactant, if desired.
