It is an object of the present invention to provide an agent for suppressing the replication of HIV, which comprises a human CD4-recognizing antibody. The object is solved by an agent for suppressing the replication of human immunodeficiency virus, which comprises, as an active ingredient, an antibody described in (1) below:(1) an antibody recognizing human CD4, which comprises, as the amino acid sequence of the variable region of a heavy chain thereof, the amino acid sequence shown in SEQ ID NO: 2 in the sequence listing, or an amino acid sequence having at least one type of mutation selected from the group consisting of deletion, substitution, inversion, addition and insertion of one or multiple amino acids with respect to the amino acid sequence shown in SEQ ID NO: 2 in the sequence listing and which also comprises, as the amino acid sequence of the variable region of a light chain thereof, the amino acid sequence shown in SEQ ID NO: 4 in the sequence listing, or an amino acid sequence having at least one type of mutation selected from the group consisting of deletion, substitution, inversion, addition and insertion of one or multiple amino acids with respect to the amino acid sequence shown in SEQ ID NO: 4 in the sequence listing.
