How can I tell which group my shinkansen is in?

Go by the destination. From Tokyo, lines heading east/north (Sendai, Aomori, Hakodate, Niigata, Kanazawa, Akita, Yamagata) need no reservation. Lines from Tokyo or Shin-Osaka heading west/south (Kyoto, Osaka, Hiroshima, Hakata, Nagasaki, Kagoshima) require a reservation.

Do strollers and wheelchairs need a reservation?

No. Strollers, wheelchairs, musical instruments and sports equipment are exempt regardless of size, with no fee, on all lines.

On a line that requires it, what if I forget to reserve?

You can still board, but a flat fee of ¥1,000 (as of June 2026) may apply per oversized item. Reserving in advance is the sure way to avoid it.

How do I know if my suitcase is too big?

Size is judged by the sum of the three sides (width + depth + height). 160 cm or under is not 'oversized' and needs no reservation on any line. Over 160 cm and up to 250 cm is 'oversized' and needs a reservation only on the western 4 lines. Over 250 cm cannot be brought aboard any shinkansen — ship it ahead by takkyubin instead.

A Big Family's Shinkansen "Large-Luggage" Map — See at a Glance Which Lines Need a Reservation and Which Don't

Note: This is an informational guide and contains no affiliate links. We state this for transparency, in line with our site-wide policy.

Inside a Hokkaido Shinkansen Hayabusa (E5 series) car — Inside the Hayabusa (E5 series) to Hakodate and Aomori — big suitcases go in the deck luggage areas, no reservation needed.

Here's the bottom line: when you bring a big suitcase onto the shinkansen, an advance reservation is required only on the "western 4 lines," while the "Hayabusa" (Tohoku/Hokkaido Shinkansen) that serves Hakodate and Aomori needs no reservation. The quietly stressful question for a big family is, "Do our big bags need a reservation, or can't we even board?" With suitcases for five or six, a stroller, and ever-growing souvenirs — the rule is actually simple. Just check which side your line is on before you leave, and you'll avoid both the extra fee and any awkwardness on the day.

First, the Conclusion: Only the "Western/Southern 4 Lines" Need a Reservation

The short answer: the "oversized-baggage seat" reservation system only exists on the Tokaido, Sanyo, Kyushu and Nishi-Kyushu lines; the eastern/northern 6 lines have no such system, so no reservation is needed.

"Oversized baggage" means a bag whose three sides (width + depth + height) add up to more than 160 cm and up to 250 cm — which covers many large suitcases. The requirement splits cleanly by line:

Shinkansen lines: is an oversized-baggage reservation required?

Shinkansen line (main destinations)	Advance reservation	Fee / rule
Tohoku & Hokkaido (Hayabusa = Hakodate / Aomori)	❌ Not needed	Just bring it aboard
Akita / Yamagata / Joetsu / Hokuriku	❌ Not needed	Just bring it aboard
Tokaido (Tokyo–Shin-Osaka)	⭕ Required	Free if reserved (¥1,000 if not, as of June 2026)
Sanyo (Shin-Osaka–Hakata)	⭕ Required	Free if reserved (¥1,000 if not, as of June 2026)
Kyushu (Hakata–Kagoshima-Chuo)	⭕ Required	Free if reserved (¥1,000 if not, as of June 2026)
Nishi-Kyushu (Takeo-Onsen–Nagasaki)	⭕ Required	Free if reserved (¥1,000 if not, as of June 2026)

Families Heading to Hakodate or Aomori Are Fine "Without a Reservation"

The short answer: the Tohoku/Hokkaido Shinkansen (Hayabusa) has no oversized-seat system at all, so you can use the in-car luggage areas without any reservation.

Board with zero paperwork: on the Tokyo → Shin-Hakodate-Hokuto Hayabusa, big suitcases and strollers need no advance steps — just bring them aboard and use the luggage space behind the seats or in the deck areas.
Easier the bigger your family: there's no "fit the bags into a reserved seat" puzzle. The family sits together and the luggage stays nearby.
Same rule with a JR Pass: the no-reservation rule is identical when you ride the Hayabusa on a pass.

【Important】Just Two Pitfalls to Watch

The short answer: the rule is easy, but two points — "a bag that's too big" and "an oversight on the western 4 lines" — are worth sorting out in advance.

① Bags over 250 cm (sum of 3 sides) can't be brought aboard: this size isn't allowed in the seating area of any shinkansen. Ship anything that large ahead to your hotel or the airport by takkyubin (luggage delivery). Always measure by the sum of the three sides, not one dimension.
② On the western 4 lines, bringing it "without a reservation" costs a fee: on the Tokaido, Sanyo, Kyushu and Nishi-Kyushu lines, bringing oversized baggage without reserving means a flat ¥1,000 (as of June 2026). Reserve in advance and there's no extra charge. Worth noting for families who also swing through the Osaka direction.
Strollers, wheelchairs, instruments and sports gear need no reservation, whatever the size: even on the 4 lines, these are not treated as "oversized baggage" and carry no fee. Reassuring for families with little ones.

From Tokyo to Hakodate: why a big family should take the Hokkaido Shinkansen + JR Pass (Hayabusa needs no luggage reservation)

Frequently Asked Questions (FAQ)

Q. I can't tell which shinkansen mine is.
A. Go by the destination. From Tokyo, east/north (Sendai, Aomori, Hakodate, Niigata, Kanazawa, Akita, Yamagata) needs no reservation. West/south (Kyoto, Osaka, Hiroshima, Hakata, Nagasaki, Kagoshima) requires a reservation. When in doubt, look for the "oversized baggage" note on the booking site.
Q. Do strollers or large kids' items need a reservation?
A. No. Strollers, wheelchairs, musical instruments and sports equipment are exempt regardless of size, with no fee.
Q. On a line that requires it, what if I forget to reserve?
A. You can still board, but a flat fee of ¥1,000 (as of June 2026) may apply. Reserving in advance is the sure thing.
Q. How do I know if my suitcase is too big?
A. Size is judged by the sum of the three sides. 160 cm or under is not "oversized" and needs no reservation on any line (a standard international check-in size of 158 cm falls here). Over 160 cm up to 250 cm is "oversized" and needs a reservation only on the western 4 lines. Over 250 cm cannot be brought aboard — ship it ahead. Check the latest rules on the JR official site.