This article provides an overview of the knife law in Japan, including what types of knives are prohibited, laws regarding carrying and selling knives, penalties for violating knife laws in Japan, exceptions to the law, frequently asked questions (FAQs), and resources. It is illegal to carry certain types of knives in public places without permission from authorities such as switchblades, gravity knives, double-edged blades longer than 5.5 inches (14 cm), and any type of knife with a curved blade longer than 4 inches (10 cm). Violations of the Japanese knife law can result in arrest or fines depending on the severity of the offense and whether or not it was intentional. There are some exceptions to the Japanese knife law that allow people to carry certain types of knives legally under certain circumstances with proper authorization.