Gluten-free in Tokyo: the part nobody warns you about
It isn't the bread. It's the soy sauce, and it's in almost everything.
Most gluten-free travel advice for Japan starts with rice and sounds reassuring. The part that catches people out is that ordinary Japanese soy sauce is brewed with wheat. That puts gluten into the marinade on the yakitori, the broth under the ramen, the glaze on the eel, the dipping sauce for the gyoza and the seasoning in a great many things that look like plain rice and fish. So the problem in Tokyo isn't finding food without bread. It's that the seasoning itself is the thing you're avoiding, and it's rarely listed.
What actually contains gluten here
Shoyu (soy sauce) unless it's specifically tamari. Most mentsuyu and teriyaki. A lot of miso. Anything described as karaage, tempura, tonkatsu or okonomiyaki. Curry roux blocks, which are wheat-thickened. Imitation crab. And crucially, the dashi or broth in a dish that otherwise looks safe. Naturally fine: plain rice, sashimi without sauce, grilled fish with salt rather than tare, yakitori ordered shio instead of tare, and most soba only if it says juwari, which means the noodles are 100% buckwheat — ordinary soba is usually cut with wheat flour.
The phrase to carry, and why to show it written
Say it and you'll be understood some of the time. Show it on your phone screen and you'll be understood almost always, because the kitchen can read it and pass it back. Carry this: 小麦アレルギーがあります。醤油やだしにも小麦が入っていることがあります。小麦が入っていない料理はありますか。 — "I have a wheat allergy. Soy sauce and dashi sometimes contain wheat too. Are there dishes without wheat?" The second sentence matters more than the first, because it's the one that tells the kitchen you already know where it hides.
Being straight about what this guide covers
The guide has 21 places tagged gluten-free, and I'm not going to pretend that's a city-wide directory. Fifteen of them are in the Roppongi and Toranomon area, with a couple each in Ginza and Marunouchi and one each in Harajuku and Asakusa, and several are expensive. That's a real limitation, and it exists because those are the places I could actually check rather than the ones with the most search traffic. If you're staying central it's genuinely useful. If you're staying in Kita or out west, it will not cover your neighbourhood yet.
What "checked" means, and what it does not
It means I've been to the place, asked, and they can serve you without wheat, usually by swapping a sauce or cooking to order. It does not mean a certified gluten-free kitchen, and it is not a coeliac safety rating. Japanese restaurants rarely have separate fryers or dedicated prep areas, and cross-contamination is a real risk that no list can settle from the outside. If you're coeliac rather than avoiding wheat by choice, treat this as a shortlist to start conversations at, ask about the fryer and the shared surfaces yourself, and take the answer from the kitchen rather than from me.
Gluten-free Tokyo: common questions
Is it hard to eat gluten-free in Tokyo?
Harder than people expect, and for a reason that surprises them: regular soy sauce is brewed with wheat, so gluten is in the seasoning rather than only in the obvious bread and noodles. It's very manageable once you know that, and much easier if you can show a written phrase.
Does Japanese soy sauce contain gluten?
Standard shoyu does, because it's brewed from soybeans and wheat. Tamari is the wheat-free version and some restaurants keep a bottle. Gluten-free travellers often carry a small bottle of tamari for exactly this reason.
Is soba gluten-free?
Usually not. Buckwheat itself is gluten-free, but most soba is cut with wheat flour for texture. The exception is juwari soba, which is 100% buckwheat. Ask for juwari specifically, and be aware the noodles may still be boiled in shared water.
What can I safely order?
Sashimi without sauce, grilled fish salted rather than glazed, yakitori ordered shio instead of tare, plain rice, and onigiri with a simple salted filling. Ordering shio rather than tare is the single most useful habit to build.
How many gluten-free places are in this guide?
Twenty-one, and I'd rather tell you that plainly than pad the number. Most are in the Roppongi and Toranomon area, with a few in Ginza, Marunouchi, Harajuku and Asakusa. It's a starting shortlist for central Tokyo, not full coverage of the city.