Are strollers allowed on the subway?

Yes, but they must be folded during peak hours if the train is crowded. Outside of rush hour, you can keep them open.

Do I need to buy a ticket for a 4-year-old?

No, children under 6 travel free on Tokyo subways when accompanied by a paying adult (up to two children per adult).

What if I get lost in the station?

Look for the Station Master's office (usually near the ticket gates). They are incredibly helpful and often have maps specifically for barrier-free exits.

How to navigate Tokyo's subway with kids

Use a Pasmo or Suica IC card to avoid buying paper tickets at every transfer, and try to avoid travel during the 7:30 AM–9:00 AM rush hour. Use the 'Tokyo Subway Navigation' app to find routes that prioritize elevators and barrier-free paths.

Get an IC card for everyone. Purchase a Welcome Suica or Pasmo Passport at the airport or major stations. Each child over 6 needs their own 'Child' card; you must visit a staffed commuter pass office at a major station with the child's passport to set the fare discount.
Use barrier-free routes. Tokyo stations are massive. Always look for the 'Elevator' signs rather than following the main flow of commuters. Use the 'Japan Transit by Jorudan' or 'Google Maps' app; check the 'wheelchair/stroller friendly' settings to avoid stairs.
Locate the Multi-purpose toilets. Almost every subway station has a 'Multipurpose' toilet (often marked with a wheelchair or baby icon). These are the only stalls large enough to fit a parent, a child, and a stroller/backpack comfortably.
Board strategically. Check the platform floor markings. Some subway lines have 'Women Only' cars during rush hour, and most platforms show exactly which door is closest to the elevator at your destination station.

Are strollers allowed on the subway?: Yes, but they must be folded during peak hours if the train is crowded. Outside of rush hour, you can keep them open.
Do I need to buy a ticket for a 4-year-old?: No, children under 6 travel free on Tokyo subways when accompanied by a paying adult (up to two children per adult).
What if I get lost in the station?: Look for the Station Master's office (usually near the ticket gates). They are incredibly helpful and often have maps specifically for barrier-free exits.