Short answer
Reserve only if your suitcase is oversized. On the Tokaido, Sanyo and Kyushu Shinkansen, baggage totalling 161–250 cm across length, width and height needs a reserved seat with an oversized baggage area. Bags up to 160 cm do not require that reservation.
What to do now
- 1Check the total of the three dimensions.
Use the label or measure length + width + height.
- 2Up to 160 cm: take it on normally.
Use the rack, footwell or deck baggage area as appropriate.
- 3161–250 cm: reserve an oversized-baggage seat.
Select the baggage-area option when booking, or ask at a JR ticket office.
- 4If you already have a ticket, ask staff before boarding.
Do not rely on using the space behind the last row without the required reservation.
Measure before you book
Add the suitcase’s length, width and height. A typical carry-on or medium checked suitcase is often 160 cm or less, but do not guess from the airline label.
A bag over 250 cm in total cannot be taken on board under JR Central’s published rule.
Do not confuse space with a reservation
There are baggage areas on some decks, but the official rule for oversized baggage is still based on the dimensions and the reserved oversized-baggage area. The last-row space is for passengers who have reserved it.
Strollers, sports equipment and instruments have separate considerations, but reserving is recommended if you need the dedicated oversized-baggage space.
If you board without a reservation
Tell the conductor rather than trying to hide the bag. JR Central says an oversized bag without a reservation can incur a 1,000-yen carry-on fee and be placed where the conductor directs; if there is no suitable space, you may need another train.
FAQ
Is there an extra fee for the reserved oversized-baggage seat?
JR Central says the seat itself is priced the same as the corresponding reserved seat; the important part is reserving the correct space.
Do I need this for local trains?
No. The published advance-reservation rule applies to the Tokaido, Sanyo, Kyushu and Nishi Kyushu Shinkansen, not ordinary conventional lines.
Official sources
Check the source directly if your journey depends on a detail.
Checked against official Japanese sources · Last verified August 13, 2026