The number that drew the headlines was 686,061. That is how many babies were born in Japan in 2024, the first time annual births had fallen below 700,000 since record-keeping began in 1899.
The figure is striking, but perhaps it isn’t the most important one in the demographic statistics.
The decline on the other side of the ledger moves faster and weighs more heavily on the totals. In 2024 the number of Japanese nationals fell by 908,574, — the 16th consecutive year of decline.
A net loss of over 900,000 Japanese nationals in twelve months is hard to picture until you anchor it to something. It is roughly a mid-sized city vanishing from the national tally between one new year and the next. The decline arrived about 15 years faster than predicted.
For context on how far the births figure has travelled, the 2024 total births is roughly a quarter of the 2.7 million peak in 1949, during the postwar baby boom. The total fertility rate sat at a record-low 1.15 in 2024, well under the 2.1 needed to hold a population steady.
Fertility rates fall in many wealthy countries, and a single year of low births is not, on its own, a crisis. What makes Japan’s case different is the ratio between the two sides of the ledger. In 2024 deaths reached about 1.6 million against fewer than 690,000 births. The Ministry of Internal Affairs and Communications recorded a natural population decline of 912,161, rising for the 17th straight year. Deaths outpaced births by roughly two to one.
That ratio is why the decline is so often described as locked in. The cohort of women of reproductive age has already shrunk, so even a sudden rebound in the birth rate would take a generation to register in the totals. Sociologists and demographers, as CNN reports, say there is no quick fix and that the decline is not reversible. The momentum is built into the age structure itself.
The population is also ageing as it shrinks. Close to 30 percent of Japan’s people are now eldery, among the highest shares of any country. A smaller working-age base supporting a growing retired population is what turns a demographic statistic into a fiscal and economic one.
One lever that recurs in the debate is immigration. Foreign residents reached a record 3.67 million as of January 2025, close to 3 percent of the total population.
A 2025 briefing from Oxford Economics, written by Yasuko Koido, models what current trends imply. At the report’s assumed pace of roughly 150,000 foreign workers a year, “Japan’s working-age population will shrink by 8% by 2035 and 15% by 2045,” it projects. These are model-dependent estimates tied to that specific assumption, not settled forecasts, but they sketch the direction of travel.
To reverse the workforce decline rather than slow it, the numbers get much larger. The briefing estimates that in a scenario where Japan accepted 500,000 people a year, “the working-age population would stabilise in the 2040s.” The catch is what that level of migration would mean for the makeup of the country. In the same modelled scenario, Koido notes, “the ratio of foreigners in the population would surge sharply from the current 3% to 30% by 2060 in this scenario,” a shift the briefing itself judges politically unrealistic for Japan as things stand.
Government modelling projects the total population could fall by around 30 percent by 2070 on current trends. Whether the annual loss settles into a steady decline or keeps accelerating may come down to a threshold no policy has yet moved: whether Japan can raise migration toward the scale its own economists model while keeping it politically acceptable, or whether the deaths-to-births ratio simply widens for another decade while that question stays unanswered.
