The first people in Japan were hunter-gatherers who arrived on the Japanese archipelago roughly 30,000 to 38,000 years ago, during the late Pleistocene. These early arrivals walked across land bridges that periodically connected the islands to the Asian mainland, and their descendants eventually became the Jomon, one of the most distinctive prehistoric cultures in the world. The story of Japan’s founding population, however, involves at least three major waves of migration spread across thousands of years.
How the First People Reached the Islands
During the ice ages, sea levels dropped enough to expose land connections between the Asian continent and what is now Japan. Archaeological evidence places the earliest Upper Paleolithic occupation of the islands at roughly 34,000 to 38,000 years ago, based on hundreds of radiocarbon-dated samples from more than 100 sites. These first arrivals used stone tools characteristic of late Pleistocene toolkits found across East Asia.
There were two main routes in. A northern land bridge formed during the early Late Pleistocene, connecting the continent to Hokkaido through Sakhalin. A western route ran through what is now the Yellow Sea and East China Sea, linking the Korean Peninsula and mainland China to Kyushu and western Honshu. These corridors opened and closed multiple times over hundreds of thousands of years as ice sheets advanced and retreated, allowing different animal species and, eventually, people to cross into the archipelago at various points.
The Jomon: Japan’s Indigenous Culture
The descendants of those Paleolithic settlers developed into what archaeologists call the Jomon culture, which lasted from roughly 14,000 BCE to 300 BCE. That is an extraordinary span of more than 10,000 years, making it one of the longest continuous cultural traditions anywhere on Earth.
The Jomon are perhaps best known for their pottery, which ranks among the oldest in the world. What makes this remarkable is that pottery typically appears alongside farming societies, but the Jomon were hunter-gatherers. They developed ceramic technology thousands of years before they or anyone nearby practiced agriculture. Early Jomon pottery was used by mobile groups, likely for cooking and food storage. As the climate warmed, particularly along the Pacific coastline of southwestern Japan, these communities settled into more permanent villages with semi-subterranean pit dwellings and made increasingly elaborate pottery.
The Jomon diet was diverse. They hunted deer and boar, gathered nuts and wild plants, and fished extensively along Japan’s long coastlines. Shell middens, the ancient garbage heaps of coastal communities, show they harvested shellfish, sea mammals, and deep-water fish. Their maritime skills were considerable for the period.
What Made the Jomon Genetically Unique
Genetic studies have revealed that the Jomon were deeply distinct from other East Asian populations. A major genetic marker found in roughly 70% of Jomon males belongs to a Y-chromosome lineage (haplogroup D1b) that is virtually absent from Korean and Chinese populations. The only other place this lineage appears at high frequency is among Tibetans, suggesting that the ancestors of the Jomon diverged from other East Asian groups long before they ever reached the Japanese islands.
This genetic signature persists today. About 35% of mainland Japanese men carry Y chromosomes that trace back to the Jomon. Among the Ainu people of Hokkaido, who are the closest living relatives of the Jomon, that frequency rises to over 80%. Genome-wide analysis tells a similar story: Jomon ancestry accounts for roughly 23 to 40% of the DNA in mainland Japanese people, while Ryukyuan populations (native to Okinawa and surrounding islands) carry 54 to 62% Jomon-derived ancestry. The Jomon genetic legacy is far from erased.
The Yayoi Migration and the Arrival of Farming
Around 900 to 300 BCE, a second major population entered the archipelago. These newcomers, associated with what is called the Yayoi period, brought transformative technologies: wet-rice agriculture, bronze tools, and iron smelting. They arrived primarily through northern Kyushu, and their cultural fingerprints point back to the Korean Peninsula, Manchuria, and the Yangtze River region of China.
Older theories proposed that massive waves of continental immigrants simply replaced the Jomon. That idea has largely been abandoned. The current understanding is that immigration certainly occurred, with refugees, traders, and farming communities crossing from Korea and China, but the indigenous Jomon population played a crucial role in the cultural transition. The Early Yayoi phase, centered in northern Kyushu from roughly 300 to 100 BCE, shows a mixed economy where people practiced rice farming alongside traditional hunting and gathering. It was a gradual blending, not a sudden takeover.
The changes that followed were dramatic. Rice paddies required irrigation systems, which demanded organized labor and social hierarchy. Settlements moved from low marshy areas to cleared higher ground. By the Middle Yayoi period (around 100 BCE to 100 CE), the culture had spread as far as present-day Nara. Populations surged. Class distinctions appeared. Small chiefdoms consolidated into larger kingdoms, including the semi-legendary Yamatai, said to be ruled by the shamaness queen Himiko.
A Third Wave During the Kofun Period
For decades, scientists explained the origins of the Japanese people with a “dual-structure” model: indigenous Jomon plus continental Yayoi migrants. A 2021 study analyzing 12 ancient genomes spanning 8,000 years of Japanese history complicated that picture. Researchers found evidence of a third, previously unrecognized influx of East Asian ancestry arriving during the Kofun period (roughly 300 to 710 CE), the era of massive keyhole-shaped burial mounds and the consolidation of imperial power.
The genetic makeup of individuals from the Kofun period closely resembles that of present-day Japanese people, suggesting that Japan’s population structure has remained largely stable for the past 1,500 years. In other words, the three-part recipe was essentially complete by the end of the Kofun era: a deep Jomon base, a substantial Yayoi contribution tied to the spread of farming, and a later East Asian component arriving during the proto-imperial age.
Where Japan’s Languages Fit In
The linguistic picture adds another layer. The Jomon almost certainly spoke languages unrelated to modern Japanese. What became the Japonic language family likely arrived with, or shortly before, the Yayoi migrants. Linguists trace Proto-Japonic to southern Manchuria and the Liaodong Peninsula, estimating it reached the Korean Peninsula between 3500 and 1500 BCE before crossing to northern Kyushu around the ninth century BCE alongside rice farming.
One leading proposal places the split between Japonic and Koreanic languages at roughly 1850 BCE. Interestingly, Proto-Japonic may have lacked dedicated vocabulary for rice, suggesting its speakers originated in a region of eastern Liaoning where millet, not rice, was the staple crop. They likely adopted rice cultivation during their time on the Korean Peninsula before carrying it to Japan. The language of the original Jomon inhabitants left little obvious trace in modern Japanese, though some scholars suspect it survives in place names and a handful of words without clear Japonic origins.
The Jomon Legacy in Modern Japan
The Ainu of Hokkaido and the Ryukyuan peoples of Okinawa preserve the strongest biological connection to the Jomon. Both groups were historically and geographically more isolated from the waves of continental migration that reshaped the population of Honshu, Shikoku, and Kyushu. Genetic data consistently shows that the Ainu are the closest living relatives of the ancient Jomon, with over 80% of Ainu men carrying the Jomon-associated Y-chromosome lineage.
But the Jomon contribution is not limited to peripheral populations. Even on mainland Japan, roughly a third of the genome traces to these original inhabitants. Every modern Japanese person carries some genetic inheritance from the hunter-gatherers who made the world’s oldest pottery, built pit houses along Pacific shores, and lived on the archipelago for tens of thousands of years before anyone else arrived.