The Tokaido Shinkansen (??????, Tokaido Shinkansen) is a shinkansen line that connects Japan's three largest metropolitan areas (Tokyo/Yokohama, Nagoya and Osaka/Kyoto) with each other. It is Japan's best used shinkansen line with departures every few minutes.

The "best" Shinkansen depends on whether you value speed, luxury, or scenic beauty. For sheer speed and modern engineering, the Hayabusa on the Tohoku Shinkansen line is the champion, reaching speeds of 320 km/h (200 mph) as it streaks toward Hokkaido. It also features the ultra-luxurious "GranClass," which is the equivalent of international first class with leather reclining seats and personal attendant service. For most tourists, however, the Nozomi on the Tokaido Shinkansen is the "best" because it is the fastest way to get between Tokyo and Kyoto/Osaka, running almost every few minutes. Note that the Nozomi requires a small supplement or a specific ticket if you are using the older JR Pass versions. If you are looking for aesthetics, the N700S (the 'S' stands for Supreme) is the newest model on the Tokaido line, featuring improved suspension for a smoother ride and power outlets at every seat. For families, the "Hello Kitty" Shinkansen in Western Japan is a unique, pink-themed experience that is a destination in itself, though it travels at slower speeds on the Kodama service.