To provide a vector for expressing a protein using a plant body.

A vector having (a) a pre-construction gene cluster having a multi-cloning region having a ribosome-binding region in the upstream of restriction enzyme sites, an insertion site that permits inserting a gene encoding a protein placed between two restriction enzyme sites and a ribosome-binding site in the upstream of the insertion site, a promoter in the upstream of the multi-cloning region and a terminator in the downstream of the multi-cloning region and (b) an identification gene cluster having genes for identifying a genetic recombinant, a promoter in the upstream of the gene and a terminator in the downstream of the gene in the upstream of the pre-construction gene cluster, are provided.