Can I take a large suitcase on the shinkansen?

The number that decides it

Measure the three sides and add them up. Under 160cm and there is nothing to arrange — the bag goes in the overhead rack or the space by your feet, as anywhere else.

Between 160cm and 250cm you have to book a seat that comes with an oversized baggage area, or a baggage compartment. Above 250cm the bag cannot be brought on board at all, so that one has to be shipped ahead instead.

Which trains this covers

The rule runs on the Tokaido, Sanyo, Kyushu and Nishi-Kyushu Shinkansen — the spine from Tokyo through Shin-Osaka and Hakata down to Kagoshima-Chuo. JR Central and JR West publish it in the same terms, which is a good sign you are reading a system rule and not one company's policy.

The reservation is a seat booking that happens to come with the luggage space beside it, so there is no separate baggage charge when you arrange it properly.

If you turn up without one

Staff will charge a baggage fee — 1,000 yen including tax — and then tell you where the bag can go. It is a fee rather than a refusal, but it is avoidable by booking the right seat in the first place.

Strollers, musical instruments and sports equipment sit outside the oversized category and can go in the racks and compartments without counting against it. If you want one of the designated oversized spaces for them, though, that still needs reserving.

Good to know

• 160cm is the three sides added together — the way airlines measure
• Over 250cm cannot be brought on board at all
• Strollers, instruments and sports gear fall outside the oversized category

Sources: JR Central — Oversized baggage · JR West — Oversized luggage · Updated Jul 2026