Pasmo is the IC card first introduced by the subway system of Tokyo. Originally, it was exclusive to the subway lines and buses of the Greater Tokyo Area while Suica was exclusive to the area's train lines. Now, both cards are interchangeable on all systems.

Yes, in 2026, PASMO and Suica are fully interchangeable for virtually all transportation and payment needs across Japan. Since the nationwide mutual integration of IC cards in 2013, these two cards—along with others like ICOCA—can be used on almost all trains, subways, and buses in Japan's major cities. If you have a Suica, you can use it on PASMO-operated private railways and subways in Tokyo; if you have a PASMO, it works perfectly on JR lines. For foreign tourists, specialized 28-day versions called Welcome Suica and PASMO Passport are available at major airports like Haneda and Narita. These tourist cards are functionally identical, though they differ in their souviner designs (Suica often features cherry blossoms, while PASMO features Hello Kitty). Furthermore, both can be added to Apple Wallet or Google Wallet for contactless "tap-and-go" entry and can be used as electronic money at millions of convenience stores, vending machines, and restaurants nationwide. The only major restriction is that you generally cannot use these cards for travel between different regional areas (e.g., from Tokyo to Osaka) unless specifically linked to a Shinkansen ticket.