A gene silencing vector according to the present invention comprises a vector which includes a promoter, an enhancer sequence in the downstream of the promoter, and a gene encoding a potyvirus-origin coat protein in the downstream of the enhancer sequence, wherein in order to cause gene silencing of the specific target gene in a host plant, the vector is used with a specific target gene or a gene that is homologous to the target gene inserted in the vicinity of the gene encoding the coat protein.