An object of the present invention is to provide a novel peptide and a novel immunostimulant or hair grower containing the peptide as an active ingredient. The present invention provides a peptide of 23 or less amino acids comprising the amino acid sequence LHRLKRLRKRL (SEQ ID NO: 1), preferably the amino acid sequence LHRLKRLRKRLK (SEQ ID NO: 9), and also provides an immunostimulant containing the peptide, a vaccine adjuvant containing the peptide, a vaccine composition containing the peptide, and a hair grower containing the peptide.