The present invention provides a CTL inducer composition which comprises one or more peptides selected from the group consisting of the peptides of SEQ ID NOS: 1 to 27 in the Sequence Listing, and can be used for the treatment or prevention of cancer or a hepatitis C virus-related disease in two or more patient groups selected from the group consisting of an HLA-A2 positive patient group, an HLA-A24 positive patient group, an HLA-A26 positive patient group, and an HLA-A3 supertype positive patient group.