Aqueous liquid composition

An aqueous liquid composition comprising the peptide and the excipient, and having a pH of 3-6:

• wherein
• the peptide is selected from the group consisting of the following (A) and (B),
• (A) a peptide consisting of the amino acid sequence shown by Arg-Met-Phe-Pro-Asn-Ala-Pro-Tyr-Leu (SEQ ID NO:
• 1), and
• (B) a peptide consisting of the amino acid sequence shown by SEQ ID NO:
• 1, wherein 1 to 3 amino acids are deleted, substituted and/or added, and having a cytotoxic T cell-inducing ability;
• and
• the excipient comprises one or more kinds selected from the group consisting of the following (C), (D) and (E),
• (C) one or more kinds of alpha hydroxy acids selected from the group consisting of glycolic acid, lactic acid, malic acid, tartaric acid, citric acid and pharmacologically acceptable salts thereof,
• (D) one or more kinds of dicarboxylic acids selected from the group consisting of malonic acid, succinic acid, glutaric acid, maleic acid and pharmacologically acceptable salts thereof, and
• (E) methionine.