An object of the present invention is to provide a method by which a peptide having a specific binding capability that can be used for purification of a target molecule can be produced at a low cost, and specifically relates to a peptide fusion protein including one or more peptides having specific binding capability and a scaffold protein, the peptide being inserted into the amino acid sequence of the scaffold protein directly or via a peptide linker, and/or being linked to the N-terminal and/or C-terminal of the scaffold protein.