Abstract: Peptides may be continuously produced by a method including the following steps (1), (A), (2), and (B): (1) performing a condensation reaction in a flow reactor to obtain an N-protected C-protected peptide in which an N-terminal amino group and C-terminal are protected by protecting groups, a side chain functional group is optionally further protected by a protecting group, and at least one of the C-terminal or the side chain functional group is protected by a pseudo-solid-phase protecting group (N-protected C-protected peptide), (A) washing a reaction mixture containing an N-protected C-protected peptide in a flow reactor and separating oil and water to separate an organic layer containing the N-protected C-protected peptide, (2) subjecting an organic layer containing an N-protected C-protected peptide to a reaction to remove a protecting group of an N-terminal amino group in a flow reactor to obtain a C-protected peptide in which an N-terminal amino group is not protected, C-terminal is protected by a pr