During the Edo period, towards the main cities, there were five major roads, all having Nihonbashi as starting point: Tokaido, Nakasendo, Nikko-Kaido, Oshu-Kaidosi and Koshu-Kaido. Inns were placed along the road and these inns were compelled to provide horse messenger services.

The Koshu-Kaido road was the main road from Nihombashi to Kofu. Because the first inn was initially too far from Nihonbashi, a decision was made to build a new inn, on the property of a daimyo named Naito. This inn was called Naito-Shinjuku (Naito new inn).

And in 1947, when Shinjuku City was created, the name was kept.

Ştiaţi că… originea numelui Shinjuku

În perioada Edo au existat cinci mari drumuri spre principalele oraşe, toate pornind din Nihonbashi: Tokaido, Nakasendo, Nikko-Kaido, Oshu-Kaidosi şi Koshu-Kaido. De-a lungul acestor drumuri erau construite hanuri, care erau obligate să ofere cai de schimb pentru serviciile de transport sau poştă.

Drumul Koshu-Kaido lega Nihonbashi de Kofu. Pentru că distanţa între Nihonbashi şi primul han era foarte mare, s-a decis să se construiască un han la jumătatea distanţei, pe proprietatea unui daimyo pe nume Naito. Hanul s-a numit Naito-Shinjuku (Naito new inn).

În 1947 când s-a înfiinţat Shinjuku city, s-a păstrat denumirea.