What is Japan's local currency? Should I get a credit card?

Currency Unit

 Entry and exit of any foreign currency is free to Japan. However, the entry of cash or other forms of cash over 1,000,000 Yen or equivalent is to be declared at the customs.

The currency of Japan is Yen (expressed in ¥). Coins are 1 ¥, 5 ¥, 10 ¥, 50 ¥, 100 ¥ and 500 ¥. Banknotes are 1,000 ¥, 2,000 ¥, 5,000 ¥ and 10,000 ¥.

Yen is obtained from the authorized Exchange offices and banks. Foreign exchange buffets operate at normal working hours at international airports. Daily fluctuations occur in the exchange rate depending on the money markets.

Traveler's Checks and Credit Cards

 Traveler's checks are accepted by large banks, hotels, ryokans and stores in major cities. International credit cards such as American Express, VISA, Diners Club, MasterCard and JCB are also available in these great options. It will benefit from 24,000 ATMs located all over the country with the symbol of “International ATM Service” (International ATM Service) and 12,000 Seven Bank ATMs in Seven-Eleven markets for your foreign credit or debit cards.