There is no limit on the amount you can bring with you to Japan or take out if Japan but you are required to fill out a customs declaration form if what you transport (currencies, checks or securities) exceeds 1 000 000 Japanese Yen worth. You can exchange currencies at most banks and also at the post office. There are also a number of Currency exchange offices that can be of assistance. Make sure to carefully check exchange rates and exchange fees.

Exchange counters at airports don’t usually have very favorable rates and Japan’s airports are no exception to that rule. Whether exchanging your money before arriving in Japan or, when flying from Japan, exchanging it before getting to the airport is recommended. If you need to exchange money at the airport look for a post office (both terminal 1 and 2 at Narita airport have post offices) as the exchange rate at the airport post offices will be the same as other post offices in Japan.