Dejima, Nagasaki: Inside Japan’s Dutch Trading Post

1. Why Was Dejima Built?

Surprisingly, Dejima was not originally built for the Dutch. Portuguese merchants had been trading with Japan since the sixteenth century, while Catholic missionaries attempted to spread Christianity. The Tokugawa shogunate gradually came to regard Christianity as a political and social threat. In 1634, construction began on an artificial island in Nagasaki harbour. Twenty-five wealthy merchants from Nagasaki helped finance the project, and in 1636 the fan-shaped Dejima was completed.

Portuguese residents were ordered to live there so their movements and contacts could be controlled. But they remained for only a few years. In 1639, the Portuguese were expelled from Japan altogether. For a short time, the newly constructed island stood empty.

2. How Did the Dutch Arrive in Japan?

The Dutch had arrived independently of the Portuguese. In 1600, the Dutch ship Liefde reached Japan after an extremely difficult voyage. One of its surviving crew members, Englishman William Adams, later became an adviser to Tokugawa Ieyasu. Formal Dutch trade followed. In 1609, the Dutch East India Company — the VOC — established a trading post at Hirado, northwest of Nagasaki.

The Dutch therefore did not arrive in Japan because the Portuguese had been expelled. They were already conducting trade decades earlier. Then, in 1641, the shogunate ordered the VOC to abandon Hirado and move its operations to Dejima. For the next 218 years, the island became the Dutch commercial base in Japan.

3. Why Were the Dutch Allowed to Stay?

The Dutch were Europeans and Christians, so why weren’t they expelled as well? The important difference was that the VOC came primarily to trade, not to convert Japanese people. That made the Dutch more acceptable to the Tokugawa authorities. During the Shimabara-Amakusa Rebellion of 1637–1638, an uprising involving many Christian peasants and samurai, the Dutch also demonstrated their willingness to cooperate with the shogunate. A Dutch ship participated in the bombardment of the rebel stronghold at Hara Castle. The episode later became associated with Dutch efforts to prove their reliability to Japanese authorities.

Their continued presence nevertheless came with strict conditions. From 1641, Dutch officials were also required to provide information about developments overseas. Japanese interpreters questioned the chief merchant when Dutch ships arrived, creating reports known as Orandafūsetsugaki, or reports of foreign news from the Dutch. Dejima was therefore more than a trading post. It was also an information channel.

4. Life Inside a Tiny Artificial Island

Dejima was remarkably small. Its distinctive fan shape measured only around 15,000 square metres, and a single guarded bridge connected it with Nagasaki. The Dutch residents did not have the freedom simply to wander into town whenever they wanted. Movement was monitored, visitors were controlled and Japanese officials supervised activities on the island. Yet Dejima was never an exclusively Dutch world.

Large numbers of Japanese worked there as interpreters, cooks, servants, officials, craftsmen and suppliers. Courtesans were also among the Japanese women permitted to visit the island. At its centre stood the residence of the opperhoofd, the chief VOC merchant, alongside warehouses, homes, kitchens and administrative buildings. Most Dutchmen stayed only temporarily. New VOC employees regularly arrived from Batavia, today’s Jakarta, the centre of the Dutch East India Company’s Asian operations. Once a year, later less frequently, the Dutch chief merchant also travelled to Edo to pay respects and present gifts to the shogun.

5. Trade Between Japan and the Dutch VOC

Trade was, of course, the reason the VOC accepted all these restrictions. Dutch ships brought commodities including raw silk, textiles, sugar, medicines and other Asian goods to Japan. Japanese products travelled in the opposite direction. Silver was particularly important during the seventeenth century, while copper later became one of the VOC’s major Japanese exports. Japanese porcelain also entered international trading networks through Dutch merchants.

More than 700 Dutch ships visited Japan between 1621 and 1847, according to Dejima’s official history. Many sailed between Nagasaki and Batavia following seasonal winds through East and Southeast Asian waters. The shogunate carefully controlled how much trade could take place, however. Dejima was never a free European commercial colony. The Japanese government determined the conditions.

6. Rangaku: When Western Knowledge Entered Japan

The most fascinating cargo arriving at Dejima wasn’t always packed into a warehouse. It was knowledge. During the Edo period, Japanese scholars developed an interest in European science transmitted largely through the Dutch language. This became known as Rangaku, literally “Dutch Learning.” Books and information entering through Nagasaki helped Japanese scholars investigate fields such as:

medicine, anatomy, astronomy, geography, mathematics, physics and botany.

Scientific instruments, maps and medical techniques also attracted attention. This didn’t mean Japan simply copied everything European. Japanese scholars studied, translated and adapted foreign knowledge within their own intellectual traditions. Dejima became one of the places where these different worlds met.

The official tourism organisation of Nagasaki emphasises that Dutch trade introduced not only commercial goods but also European medical and scientific knowledge. That cultural exchange ultimately mattered far beyond the profits of the VOC.

7. Siebold and the Scholars of Dejima

One of the most famous Europeans associated with Dejima was the German physician Philipp Franz von Siebold. He arrived in 1823 as a doctor employed in Dutch service. Siebold became deeply interested in Japanese plants, animals, geography and culture. Japanese scholars, meanwhile, wanted to learn about Western medicine and science from him. In 1824, he established a school at Narutaki, outside Dejima, where Japanese students could study Western medicine.

But his career in Japan ended dramatically. In 1828, authorities discovered that Siebold possessed maps and other materials that foreigners were not permitted to take out of Japan. The resulting Siebold Incident led to his expulsion. His story illustrates something important about Dejima. Knowledge moved through the island — but the shogunate still tried to control exactly what knowledge travelled in which direction.

8. How Dejima Disappeared

By the middle of the nineteenth century, Japan’s foreign relations were changing rapidly. After Commodore Matthew Perry arrived in 1853, a series of treaties gradually opened Japanese ports to international trade. The Dutch trading monopoly at Dejima could not survive this new world. In 1859, the Dutch Factory was abolished and replaced by a consulate. Foreign merchants of other nationalities were now able to operate in Nagasaki.

Then Dejima itself began to disappear. Land reclamation expanded the surrounding harbour. Roads and river works altered its shape. By the early twentieth century, the former island had become absorbed into mainland Nagasaki. In 1904, the original fan-shaped island effectively disappeared from the landscape altogether.

9. Reconstructing Dejima Today

Fortunately, Nagasaki did not forget what had been here. The city began planning the recovery of the historic Dejima site as early as 1948, gradually reacquiring land and investigating its archaeology. A major restoration project began in 1996. Today’s Dejima is therefore largely a historical reconstruction.

The restored buildings are based on archaeological evidence, maps, drawings and historical records. Much of the reconstructed streetscape represents Dejima around 1820, when figures such as J.C. Blomhoff and later Siebold were associated with the island.

Inside, you’ll find reconstructed living quarters, warehouses, administrative rooms, exhibitions and a miniature model showing just how small the original island was. No eighteenth-century Dutch street has miraculously survived intact. But the reconstruction helps make an otherwise vanished landscape understandable again.

10. Visiting Dejima in Nagasaki

Dejima lies in the centre of Nagasaki, making it easy to combine with other historical attractions. From Nagasaki Station, you can walk there or take one of the city’s trams to the Dejima stop. I would allow around 1½ to 2 hours if you want to explore the restored houses and exhibitions without rushing. Check the official Dejima website before visiting for current opening hours and admission prices, as these can change.

And while walking through the reconstructed streets, keep the island’s tiny dimensions in mind. For more than two centuries, this small piece of reclaimed land connected two worlds. Dutch merchants came looking for profit. Japanese officials came to regulate them. Interpreters moved constantly between languages and cultures. Scholars came looking for knowledge.

Goods crossed the bridge.

Books crossed the bridge.

Ideas crossed the bridge.

And although modern Nagasaki eventually swallowed the island itself, Dejima’s importance was always much larger than its size.