To provide a method for producing a virus-like particle of avian infectious bronchitis virus.

An infectious bronchitis virus-like particle is produced by transducing a plasmid DNA expressing a gene encoding a spike protein of avian infectious bronchitis virus, a gene encoding an envelop protein, a gene encoding a membrane protein and a gene encoding a nucleocapsid protein into a eukaryotic cell, culturing the cell and recovering the object particle from the culture supernatant fluid. Since the virus-like particle is not virus, it is expected to have a function as a safe recombinant component vaccine absolutely free from the risk of producing the disease in chicken.