The present invention belongs to the pharmaceutical technical field, and relates to a salt of a polypeptide vaccine and a method for producing the same, and particularly to KIFGSLAFL acetate, a method for producing the salt and a pharmaceutical product containing the salt. [Selection] Figure 1本発明は製薬技術分野に属し、ポリペプチドワクチンの塩及びその製造方法、特にKIFGSLAFL酢酸塩及びその製造方法と該塩を含む医薬製品に関する。【選択図】図1