<;P>;PROBLEM TO BE SOLVED: To provide an Stx toxicity inhibitor peptide which demonstrates a toxic inhibiting action excellent in both Stx1 and Stx2, and to provide a therapeutic agent of a disease resulting from Stx1 and Stx2. <;P>;SOLUTION: The Stx toxicity inhibitor peptide includes combining a peptide of sequence number 1 to each of four amino groups located at both ends of a molecule nuclear structure formed by binding three lysines (Lys), directly or through a spacer. <;P>;COPYRIGHT: (C)2011,JPO&INPIT