A peptide that consists of a portion of an HMGB1 protein and has an activity of stimulating migration of a cell, wherein said peptide consists of any one of the amino acid sequences below: the amino acid sequence of position 1 to position 44 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5; the amino acid sequence of position 1 to position 70 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5; the amino acid sequence of position 1 to position 84 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5; the amino acid sequence of position 1 to position 170 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5; the amino acid sequence of position 1 to position 185 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5; the amino acid sequence of position 1 to position 195 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5; the amino acid sequence of position 2 to position 44 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5; the amino acid sequence of position 2 to position 70 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5; the amino acid sequence of position 2 to position 84 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5; the amino acid sequence of position 2 to position 170 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5; the amino acid sequence of position 2 to position 185 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5; the amino acid sequence of position 2 to position 195 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5; the amino acid sequence of position 17 to position 25 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5; the amino acid sequence of position 45 to position 84 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5; the amino acid sequence of position 85 to position 169 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5; the amino acid sequence of position 89 to position 185 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5; the amino acid sequence of position 89 to position 195 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5; and the amino acid sequence of position 93 to position 215 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5. the amino acid sequence of position 1 to position 44 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5; the amino acid sequence of position 1 to position 70 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5; the amino acid sequence of position 1 to position 84 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5; the amino acid sequence of position 1 to position 170 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5; the amino acid sequence of position 1 to position 185 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5; the amino acid sequence of position 1 to position 195 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5; the amino acid sequence of position 2 to position 44 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5; the amino acid sequence of position 2 to position 70 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5; the amino acid sequence of position 2 to position 84 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5; the amino acid sequence of position 2 to position 170 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5; the amino acid sequence of position 2 to position 185 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5; the amino acid sequence of position 2 to position 195 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5; the amino acid sequence of position 17 to position 25 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5; the amino acid sequence of position 45 to position 84 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5; the amino acid sequence of position 85 to position 169 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5; the amino acid sequence of position 89 to position 185 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5; the amino acid sequence of position 89 to position 195 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5; and the amino acid sequence of position 93 to position 215 in the amino acid sequence of any one of SEQ ID NOs: 1, 3, and 5.