Irori: an open hearth cut right into the floor of the house
Irori is an open hearth: a square pit in the floor of a minka house, filled with ash, where a fire was kept burning constantly. It was used to cook food in a pot suspended from a hook, to heat the living room, and it provided the main light in the house before electricity. By the 1960s such hearths had disappeared from most homes, but they can still be seen in the village of Shirakawa-go, old ryokan, and museums.
Irori is not just a fire in the house, but the center of all daily life: people ate, worked, and assigned seats by seniority around it. The hearth has its own linguistic story — the character 炉, which appears both in its name and in the word for 'nuclear reactor.' Let's look at how the irori is built, where the smoke went without a chimney, and where such hearths can still be seen.
A square pit with fire in the middle of the house
Irori is a square pit in the floor of a traditional Japanese minka house, filled with ash, in which an open fire burns. Above the fire, a hook called jizaikagi hangs from a ceiling beam, from which a pot or kettle is suspended, and the height of the hook is adjusted to make the fire burn stronger or weaker. The same fire cooked food, heated the house, and lit the room all at once.
- 自在鉤 (jizaikagi) — a hook with a lever used to change the height of the pot suspended over the fire.
- The horizontal bar on the hook was often carved in the shape of a fish: fish live in water, and such a shape was considered protection from fire.
- The thick layer of ash around the fire insulates the heat and prevents the flames from spreading to the wooden floor.
Not every hearth is called an irori
Irori is specifically a permanent hearth in the living area of the house, not a cooking stove 竈 (kamado) and not a portable brazier hibachi. The three objects in an old Japanese house often stood side by side, but each had its own purpose.
Smoke without a chimney and a special place by the fire for everyone
The irori had no chimney: the smoke simply rose to the ceiling and escaped through gaps in the roofing or a hole in the roof. The soot from the smoke impregnated the beams and the thatched roof with tar, which dried the straw, strengthened the wood, and repelled insects — the house only benefited from such smoke.
- 横座 — the place of the head of the house, farthest from the earthen floor, the most honorable.
- 客座 — the place for a guest.
- 木尻 (kijiri) — the place nearest the earthen floor, usually for children or the lower-ranking members of the household.
Where the irori can still be seen
After the war, with the arrival of electricity, the irori quickly disappeared from most homes by the 1960s. But not everywhere: the hearth has been preserved in the gassho-zukuri houses of the village of Shirakawa-go, which was added to the UNESCO World Heritage List in 1995, as well as in some ryokan and museums of folk life.
炉 — the hearth in the name irori and in the word 'reactor'
炉 — значение: hearth, stove, furnace — онъёми: ロ — кунъёми: いろり — 8 штрих(ов). 炉 — 'hearth, stove': 囲炉裏 literally 'surrounded hearth', and the same character appears in 原子炉 'nuclear reactor' and in 炉端焼き 'food cooked at the hearth'.
The same fire — different scale
炉 is read ro in compound words: 原子炉 (genshiro) — nuclear reactor, literally 'hearth of the atom', and 暖炉 (danro) — a Western-style fireplace. 炉端焼き (robatayaki) — dishes cooked right at the open fire, in memory of that very hearth in the floor. One character links a tiny home fire and an industrial reactor — both literally 'hearth', only on different scales.
| Japanese | Reading | Translation |
|---|---|---|
| 囲炉裏 | irori · irori | Irori |
| 原子炉 | genshiro · genshiro | Nuclear reactor |
| 暖炉 | danro · danro | Fireplace |
| 炉端焼き | robatayaki · robatayaki | Dishes cooked at an open hearth |
FAQ
- What is an irori?
- A square pit in the floor of a traditional Japanese house, filled with ash, where an open fire burned. A pot or kettle hung from a hook above it, and the same fire cooked food, heated the house, and lit the room.
- How did smoke escape from the irori?
- The irori had no chimney: the smoke rose to the ceiling and escaped through gaps in the roofing or a hole in the roof. The soot from it impregnated the beams and straw, strengthening them and repelling insects, rather than just dirtying the house.
- Why was there a hook above the hearth?
- The hook 自在鉤 with a lever allowed the pot or kettle to be raised and lowered over the fire, adjusting the heat without extra stands. The horizontal bar on the hook was often carved in the shape of a fish — as a charm against fire.
- Are there any houses with an irori left?
- In most ordinary homes the hearth disappeared by the 1960s along with electrification. But it has been preserved in the gassho-zukuri houses of the village of Shirakawa-go, which was added to the UNESCO World Heritage List in 1995, as well as in some ryokan and museums.
Sources
Updated: 2026-09-21