Many Japanese homes keep not one household altar but two: a kamidana (神棚), a small Shinto shrine mounted high on a wall for the kami, and a butsudan (仏壇), a Buddhist altar for the family's ancestors. Together they bring the country's two great religions into the fabric of daily home life, one facing the gods, the other honouring the dead.
The kamidana: a shelf for the gods
A kamidana is literally a "god shelf": a miniature wooden shrine set high on a wall, above head height, in a clean and bright part of the home. Inside it are kept ofuda (御札), paper talismans from a shrine — often one from the great shrine of Ise and one from the local shrine — that hold the presence of the kami. Each day or on set days, the household makes small offerings before it: rice, water, and salt, sometimes sake, and greets the gods with a bow and a clap, as at a shrine. It is a shrine visit brought home, a way of keeping the household under the gods' protection and giving daily thanks.
The butsudan: honouring the ancestors
The butsudan is a very different presence: a cabinet-like altar, often of dark lacquered wood, that holds a Buddhist image and, crucially, the memorial tablets (ihai) inscribed with the names of deceased family members. Here the family cares for its ancestors (先祖, senzo): offering incense, food, and flowers, reporting news to the departed, and praying for them, especially at Obon and death anniversaries. To have both a kamidana and a butsudan in one house captures the everyday Japanese arrangement of religion: turning to Shinto for life, growth, and blessing, and to Buddhism for death, memory, and the ancestors.
Words & idioms to take away
Idioms & proverbs to carry away
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神棚 vs 仏壇: the kamidana (神棚), "god shelf," is the Shinto home altar for the kami; the butsudan (仏壇), "Buddha altar," is the Buddhist one for the ancestors. Many homes keep both.
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位牌 (ihai): a memorial tablet inscribed with a deceased person's posthumous name, kept in the butsudan as the focus of remembrance and daily offerings.