This article explores the prevalence and cultural/economic significance of twins in Japan. The twin birth rate is low compared to other countries, but has been steadily increasing due to assisted reproductive technology and women having children later in life. Twins have long been seen as symbols of luck and prosperity in Japanese culture, and there have been many famous sets of twins throughout history. There are also economic impacts such as increased costs for raising multiple children at once, as well as potential benefits to businesses if more parents invest in products designed for multiples. Challenges for parents with twins include finding adequate childcare services and ensuring each child gets enough individual attention.