Netherlands Indian roepiah

Japanese government-issued currency in the Dutch East Indies
Denominations
Subunit
1/100	cent, sen
Plural	gulden, roepiah
cent, sen	cents, sen
Symbol	N/A
Banknotes	1, 5, 10 cents ½, 1, 5, 10 gulden (first issue) ½, 1, 5, 10, 100 roepiah (second issue)
Coins	1, 5, and 10 sen (never released)
Demographics
User(s)	Occupied Dutch East Indies
Issuance
Central bank	Imperial Japan
Mint	Japan Mint, Osaka Branch
Website	http://www.mint.go.jp/category/eng
Valuation
Pegged with	Japanese yen
This infobox shows the latest status before this currency was rendered obsolete.

The Netherlands Indies gulden, later the Netherlands Indies roepiah ([ruˈpiah]), was the currency issued by the Japanese occupiers in the Dutch East Indies between 1942 and 1945. It was subdivided into 100 sen and replaced the gulden at par.

In December 1941, the Empire of Japan began its assault on British Borneo; by January 1942 its armies had begun to attack those parts of the island which were part of the Dutch East Indies. This was followed by attacks on Sumatra and Java in February. Ultimately, the Dutch colonial government capitulated on 8 March 1942, though pockets of resistance lasted for several months. In the succeeding months, the Japanese government closed the existing banks, seized existing assets and currency, and assumed control of the Indies' economy.

Java was left under the administration of the Sixteenth Army, Sumatra under the Twenty-Fifth Army, and the remainder of the archipelago under the Japanese Navy. This administrative division meant that some notes were highly localized. For instance, the 100 and 1000 gulden notes, with a design similar to that used in occupied Malaya (also under the Twenty-Fifth Army), were only meant to be circulated in Sumatra. There is no evidence, however, that the latter were actually in use.

The Japanese occupation government immediately began issuing military banknotes for use in the occupied Indies, as had previously been done in other occupied territories. These first banknotes were printed in Japan, and issued by the Ministry of Finance. This issue formally retained the gulden name, though in common indigene parlance it was called oeang Djepang (Japanese money) or oeang pisang (banana money, for the prominent bananas on the ten gulden note). Each gulden (or, later, roepiah) consisted of 100 cents (sen).