The present invention relates to: a method for producing a transgenic plant expressing miraculin, comprising introducing a miraculin gene into a useful plant that can be easily produced and cultivated throughout the year using plant molecular breeding technology; a transgenic plant expressing miraculin, which is produced by the method; and the use thereof. The present invention also relates to a food additive, a food or drink, or an antidiabetic drug, which contains miraculin that is produced by the transgenic plant.