日本出生人数降至70.5万人，10年里下降30%

Group 1 - The number of children born in Japan in 2025, including foreigners, decreased by 2.1% compared to the previous year, reaching 705,809, marking the lowest figure since comparable data began in 1899. This decline is occurring 17 years faster than the Japanese government's future estimates, indicating a need for a redesign of social security systems, including a reassessment of benefits and burdens [2][4]. - The Ministry of Health, Labour and Welfare reported that the number of births has decreased by 30% over the past decade, with the rate of decline slowing compared to the average annual decrease of over 5% from 2022 to 2024 [4]. - The number of marriages in Japan in 2025 increased by 1.1%, reaching 505,656, surpassing 500,000 for the first time in three years, indicating a recovery from the significant decline caused by COVID-19 restrictions [6]. Group 2 - The National Institute of Population and Social Security Research's future population estimates suggest that the number of births, including foreigners, will fall to the 700,000 range by 2042, with actual figures already approaching this low point [6]. - The institute's main "neutral estimate" for births in 2025 is 774,000, while the lower "pessimistic estimate" is 681,000, highlighting the concerning trend in birth rates [6].