Technically, there is no limit to the amount of cash you can bring into Japan; however, if you are carrying more than 1 million Japanese Yen (or the equivalent in other currencies, checks, or gold), you are legally required to declare it to Customs. The 1 million Yen threshold is roughly equivalent to $6,500 to $7,000 USD, depending on current exchange rates. Failing to declare amounts over this limit can result in the money being seized or the passenger facing significant fines. For most tourists, carrying smaller amounts of cash is advisable for convenience, but if you are bringing a large sum for a major purchase or event, simply ensure you fill out the "Declaration of Carrying of Means of Payment" form upon arrival.