PROBLEM TO BE SOLVED: To provide an agent for improving the efficiency of obtaining a transgenic plant and a method for improving the efficiency of obtaining a transgenic plant.SOLUTION: According to the present invention, there is provided an agent for improving the efficiency of obtaining a transformed plant. The agent consists of a vector that comprises a gene encoding a glycine betaine biosynthetic enzyme. There is also provided a method for improving the efficiency of obtaining a transgenic plant into which a foreign gene has been introduced. The method comprises introducing a gene encoding a glycine betaine biosynthetic enzyme together with the foreign gene into a plant cell.SELECTED DRAWING: None【課題】形質転換植物体の獲得効率の向上剤、及び形質転換植物体の獲得効率を向上させる方法を提供する。【解決手段】グリシンベタイン生合成酵素をコードする遺伝子を含むベクターからなる、形質転換植物体の獲得効率の向上剤、及び、外来遺伝子を導入した形質転換植物体を獲得する効率を向上させる方法であって、植物細胞に、前記外来遺伝子と共に、グリシンベタイン生合成酵素をコードする遺伝子を導入することを特徴とする、形質転換植物体の獲得効率向上方法。【選択図】なし