In the essay, while referring to the conventional developmental psychology, the research and experiments that the collaborators are currently in charge of are considered from the viewpoint of "a nursing toy that fosters curiosity". When considering the toys for visually impaired infants targeted in this study, the goal of nursing toys is to reach the understanding of the subjects and the acquisition of operations as soon as possible. However, he pointed out that there is a limit to the attractiveness of therapeutic toys as a toy, and was able to present it as a product design issue. (Responsible for research and research assistance. 5th Tanimoto, 4 others)