Butsudan Components Glossary: Honzon, Ihai, Butsugu & the Architecture of the Altar

Curator’s Note:

A butsudan is not “a cabinet with religious things inside.” It is a structured space with an internal hierarchy. Each element—central figure, memorial tablets, lamps, incense tools—has a purpose, and each position implies a relationship: reverence, support, remembrance, and daily continuity.

This glossary is written as a reference system you can return to while viewing objects, reading listings, or setting up a household altar. It avoids forced certainty: because practice varies by Buddhist school (宗派) and family tradition, the correct approach is not rigid rules but respectful, informed placement.

Quick Map of the Butsudan (How to Read the Interior):

1. Center (Back / Highest): the honzon — the primary object of reverence.
2. Support (Back / Upper): hanging lamps or interior ornaments that frame the sacred space.
3. Ritual field (Mid / Lower): tools used daily—incense, candles, flowers, bell.
4. Remembrance (Mid / Lower / Side): memorial elements such as ihai may appear depending on household practice.
5. Threshold (Front): doors, rails, and the opening/closing gesture that turns furniture into “a space.”

Core Sacred Terms:

Honzon  — Central Object of Reverence

The honzon is the main figure, image, or calligraphy enshrined at the center of the butsudan. It is the altar’s spiritual orientation—the “north star” everything else serves.

• Common forms: statue; hanging scroll (kakejiku); sacred calligraphy or mandala (school-dependent).
• Photo cues: centered, elevated, visually framed; often within a zushi or on a raised platform.

Zushi  — Inner Shrine / Miniature Sanctuary

A zushi is a small shrine structure inside the butsudan used to enshrine the honzon. It creates an additional inner boundary and often carries the most refined gilding or carving.

• Photo cues: smaller doors within the main doors; a centered inner pedestal or architectural frame.

Butsuma  — Household Altar Room / Alcove (Context Term)

Butsuma refers to a traditional room or alcove dedicated to the butsudan. Modern homes may not have a butsuma, but the concept explains historical sizing and placement logic. Practical takeaway: stability, cleanliness, accessibility, and respect.

Memorial & Remembrance Elements:

Ihai  — Memorial Tablet

Ihai are memorial tablets associated with deceased family members. Often black lacquer with gold inscriptions. Treat with heightened respect and cultural sensitivity.

Kakochō  — Memorial Register Book

A memorial book listing names and dates of the deceased, sometimes displayed on a stand.

Offerings (Osona-e) — Food, Water, and Daily Gestures

Offerings may include water/tea, rice, fruit, sweets, or seasonal items. The most respectful offering is simple and consistent.

Ritual Implements (Butsugu):

Butsugu  — Altar Implements (Category)

Butsugu refers to altar tools: incense vessels, candle stands, flower vases, bell, offering cups, and supports. A common baseline triad is incense, light, and flowers.

Kōro  — Incense Burner

A vessel for burning incense, often placed centrally among the tools.

Rōsoku-tate  — Candle Stand

Candle holders (often in pairs). For antiques, many collectors substitute LED candles for safety and preservation.

Hana-tate  — Flower Vase

Vases for fresh flowers or seasonal greens (often in pairs). The point is living presence, not luxury.

Rin — Bell

A bell struck to begin, punctuate, or close practice; often placed on a cushion (rinza) or stand.

Rinbō  — Bell Striker

The mallet used to strike the rin. Missing strikers are common in older sets.

Takatsuki / Offering Stands

Raised stands for offerings, often lacquered.

Supporting incense tools

Tongs, spoons, ash rakes, and containers may appear. Do not confuse incense-ceremony tools with household essentials; overlaps exist, intent differs.

Lighting & Interior Architecture:

Hanging lamps

Interior lamps that frame the honzon. Handle gently; if shipping, secure separately and pad thoroughly.

Gold interior

Reflective interior fields create a luminous sacred space. Patina and smoke-darkening can be honest age. Avoid solvents and oils.

Rails, tiers, and platforms

Interior steps establish hierarchy: honzon elevated; tools below; memorial elements placed respectfully. If you can read the tiers, you can set up with restraint even without sect certainty.

Doors, Threshold & Hardware:

Outer doors

Opening and closing the doors is part of meaning: doors turn furniture into a space entered through attention.

Kanagu — Metal fittings and hardware

Hinges, corner plates, handles, and ornaments. Patina is normal. Avoid harsh polishing; stabilize gently if needed.

Unknown Sect: Safe Baseline (Reference Only)

• Prioritize cleanliness, symmetry, and restraint.
• Center the honzon area (or leave it respectfully empty if missing).
• Place the incense burner centrally on the working tier.
• Place candle stands and flower vases symmetrically if you have pairs.
• Keep memorial elements respectful and avoid crowding the center.

Full step-by-step setup will be published as: How to Install and Set Up a Butsudan.

Photo ID Quick Checklist

• Is there a central bay sized for a honzon or scroll?
• Is there an inner shrine (zushi)?
• Are hanging lamps or lamp mounts present?
• Are tiers intact (no warping)?
• Are ritual tools matched or mixed?
• Are memorial tablets present (handle with sensitivity)?
• Is the hardware complete (handles, hinges, key plates)?

Utility Links

• Return to the Butsudan Collection
• What Is a Butsudan?
• Installation & Setup Guide
• Types of Butsudan (preassigned)
• Butsudan vs Kamidana (preassigned)
• Butsugu Object Archive (preassigned)