This article provides an overview of Japan's immigration policies and procedures, as well as tips for successfully re-entering the country after leaving. Non-citizens must obtain a visa or other authorization before entering Japan, and must follow all applicable laws while in the country. Different types of visas are available depending on the purpose of your visit. In order to enter Japan as a non-citizen, you must first obtain a valid passport from your home country and have proof of sufficient funds for your stay. When re-entering Japan after leaving, you may need to apply for a new visa or other authorization and provide additional documents or undergo additional screening processes than when you initially entered the country. Special cases such as diplomatic/official visas and dual citizens may be allowed back into the country without having to reapply. Tips are provided to make sure that your experience entering back into Japan goes smoothly.