The present invention pertains to a method for obtaining transformed cells of a plant. The present invention includes the following steps: (a) a step for co-transforming plant cells with desired DNA and a first marker gene； and (b) a step for selecting transformed cells into which the desired DNA has been introduced and the first marker gene has not been introduced into the chromosome from among the transformed plant cells obtained in step (a), but does not include a step for removing transformed cells into which only the desired DNA has been introduced into the chromosome by positive selection using the first marker gene.
