This paper, in order to grasp the current state of research on genetics education in Japan, addresses the following two research questions by reviewing previous research on genetics education in Japan targeting secondary education: (1) What educational phenomena have been dealt with in what quantity and proportion in this field, and (2) What research questions have mainly been discussed in relation to various educational phenomena. The results show that, while there has been a great deal of research on “teaching materials and equipment”, research on “value, objectives, and goals” has been lacking. Also, when comparing these results with international research trends, this paper points out four issues that should be considered in research on genetics education in Japan.