[Problem] To provide a polypeptide which enables stimulation of numerous T cells of different derivation, and to induce strong immunological response against numerous types of cancers.[Solution] Provided is a fused polypeptide that includes a helper epitope derived from the WT1 protein, and a killer epitope derived from the WT1 protein, wherein the polypeptide includes a total of 3 to 6 of the helper epitopes and the killer epitopes per molecule of the fused polypeptide.