Conjugate vaccine targeting disorder-causing in vivo protein

The present invention provides a vaccine including a conjugate of a peptide comprising an amino-acid sequence indicated by SEQ ID NO: 1 and an epitope of an in vivo protein that is a cause of a disorder, such as DPP4, IL-17A, IgE, S100A9 and PCSK9. The vaccine has low antigenicity to carrier proteins and has effective antibody producibility as a vaccine.