The Japanese Yen is the currency of Japan. One yen corresponds to 100 sen. However, sen are usually not used in everyday life anymore, except in stock market prices. Bills come in 1,000 yen, 2,000 yen (very rare), 5,000 yen and 10,000 yen denominations. Coins come in 1 yen, 5 yen, 10 yen, 50 yen, 100 yen and 500 yen denominations. Counterfeit money is not an issue in Japan.