To provide a transgenic rice plant that can produce rice which can be used as an "edible vaccine", i.e., rice capable of inducing a desired immune response when mucosally administered such as an oral administration. There is provided a transgenic rice plant including a genomic DNA, wherein a DNA construct is incorporated into the genomic DNA so that the DNA construct is capable of being expressed, wherein the DNA construct includes a DNA encoding an antigenic protein, and a rice endosperm specific promoter linked upstream thereof.