[Problem] To provide an anti-human PAI-1 antibody for preventing or treating pulmonary fibrosis by binding to active human PAI-1 and inhibiting effects mediated by the active human PAI-1. [Means for Solution] The present inventors have investigated anti-PAI-1 antibodies and consequently have provided an anti-human PAI-1 antibody comprising a heavy chain variable region consisting of the amino acid sequence of amino acid numbers 1 to 118 of SEQ ID NO: 2 and a light chain variable region consisting of the amino acid sequence of amino acid numbers 1 to 108 of SEQ ID NO: 4.