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Can I take a big suitcase on the shinkansen? The oversized-baggage rule

This answer is a draft. It stays unpublished until legal review and source verification are complete.

The answerMeasure your suitcase: if the sum of its three sides (height + width + depth) is over 160 cm — roughly any checked bag larger than about 28 inches — you must reserve a "seat with oversized baggage area" (the last row of a car, or a compartment) on the Tōkaidō, Sanyō and Kyushu shinkansen. The reservation is free with your ticket, but boarding without it costs a ¥1,000 fee and you may be asked to move the bag. Bags up to 160 cm total go on the overhead rack or at your feet without booking. Over 250 cm total is not allowed at all. The Tōhoku, Hokkaidō, Hokuriku and Jōetsu lines have no such rule but have less space. The alternative is luggage forwarding (takkyūbin), which most seasoned visitors prefer.

Since May 2020 the Tōkaidō, Sanyō and Kyushu shinkansen — the Tokyo–Kyoto–Osaka–Hiroshima–Fukuoka lines that almost every visitor rides — require a reservation for large suitcases, and charge a ¥1,000 handling fee for bringing one without it. Many travellers still do not know, and the rule is exactly the kind of thing that ruins a smooth trip.

The rule in numbers

Size (sum of three sides)	Rule	Where
Up to 160 cm (e.g. 70 × 50 × 30 = 150)	No reservation needed. Overhead rack (fits up to about 60 cm tall) or footwell	All shinkansen
161–250 cm ("oversized", tokudai nimotsu)	Must reserve a seat with oversized baggage area (last row of a car — space behind the seats — or a locked luggage compartment near the doors). Reservation is free. No reservation: ¥1,000 fee and staff move the bag	Tōkaidō, Sanyō, Kyushu, Nishi-Kyushu shinkansen (Tokyo–Nagoya–Kyoto–Osaka–Hiroshima–Hakata–Kagoshima, and Takeo-Onsen–Nagasaki)
Over 250 cm	Not permitted on board	Same lines
Exceptions	Strollers, wheelchairs, musical instruments, sports gear in cases are exempt from the reservation requirement	—

How to reserve: ticket machines and counters (say "tokudai nimotsu supēsu tsuki zaseki"), the SmartEX / EX app, and JR Pass holders can reserve at counters — the rule applies to pass holders too. Space is limited to the last row of each car (about 5 seats in ordinary cars, 4 in Green Cars) plus the seats tied to the locked baggage compartments, so book early in peak seasons.
Which lines don't have the rule: Tōhoku, Hokkaidō, Akita, Yamagata, Jōetsu, Hokuriku shinkansen (JR East / JR West to Kanazawa/Tsuruga) — no fee, but luggage space is genuinely scarce; behind the last row is first-come.
The usual suitcase: a standard "large" 28-inch case is about 76 × 52 × 30 = 158–165 cm — right on the line. Measure with the wheels and handle. Cabin-size bags (115 cm) are always fine.
Where to put a mid-size bag on regular seats: the overhead rack takes cases up to roughly 55–60 cm; larger ones go at your feet in the aisle seat, or behind the last row if empty (first-come).
Luggage forwarding (takkyūbin) is the alternative most visitors end up preferring: ¥2,000–3,000 per suitcase, hotel-to-hotel next day (same day is rare), from any hotel front desk or convenience store. Carry an overnight bag and travel light on the train (see the coin-locker and forwarding article).
Green Car: the same size rules apply; Green Cars have slightly more rack space. (Gran Class exists only on JR East/West lines, where the reservation rule does not apply.)
Limited-express trains (Narita Express, Haruka, Thunderbird) have luggage racks near the doors and no size fee.

[Verify] Current fee (¥1,000) and the exact list of lines with JR Central/West/Kyushu pages; check whether Hokuriku extension segments have adopted the rule.

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Sources

JR Central — Oversized baggage on the Tokaido Shinkansen (rules, reservation, fee)

https://global.jr-central.co.jp/en/info/oversized-baggage/

JR West — Oversized Luggage (Sanyo Shinkansen)

https://www.westjr.co.jp/travel-information/en/train-usage-guide/luggage/

JR Kyushu — Baggage rules on the Kyushu and Nishi-Kyushu Shinkansen

https://www.jrkyushu.co.jp/english/

⚠️ Editorial note: the source URLs above were identified by search. Our working environment cannot reach go.jp domains, so the contents have not been checked against the text. Verify every source before publication and record who checked it and when.

About this article

What we share here are ideas and everyday practices passed down among people living in Japan, together with general information drawn from public sources. They are not official recommendations, and they are not professional instruction. Practices vary between households and regions.

This is general information. Results vary from person to person and depend on your own conditions and surroundings.

Please decide for yourself, using your own judgement, whether any of this suits your situation. We cannot accept responsibility for any damage, loss or injury arising from following this article.

Rules and procedures change. Please confirm the latest official information before you act.

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Can I take a big suitcase on the shinkansen? The oversized-baggage rule

The rule in numbers

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