[Problem] To provide an anti-human PAI-1 antibody for prevention and treatment of pulmonary fibrosis by binding to active human PAI-1 and inhibiting effects mediated by active human PAI-1. [Solution] The inventors studied anti-PAI-1 antibodies, and provided an anti-human PAI-1 antibody that contains: a heavy-chain variable region comprising the amino acid sequence from amino acid 1 to 118 in SEQ ID No. 2; and a light-chain variable region comprising the amino acid sequence from amino acid 1 to 108 in SEQ ID No. 4.