---
title: "大樹生命保険"
aliases: ["大樹生命", "Taiju Life", "Taiju Life Insurance", "大樹生命保険株式会社", "三井生命"]
domain: life-insurers
created: 2026-05-21
last_updated: 2026-07-30
last_tended: 2026-07-30
review_by: 2026-11-21
confidence: likely
tags: [JapanFG, insurance, life-insurance, nippon-life, operating-company]
status: active
sources:
  - "https://www.fsa.go.jp/menkyo/hoken.pdf"
  - "https://www.seiho.or.jp/member/list/"
  - "https://www.taiju-life.co.jp/"
---

# 大樹生命保険


## Wiki route

This entry sits under [[life-insurers/INDEX|life-insurers INDEX]]. Read it against [[life-insurers/hanasaku-life|はなさく生命保険]] for peer / contrast context and [[insurance/INDEX|insurance index]] for the broader system / regulatory boundary.

## TL;DR

大樹生命保険株式会社は、金融庁の生命保険会社免許一覧に掲載される life-insurance operating company。旧三井生命として知られる lineage を持ち、現在は [[life-insurers/nippon-life]] group adjacency を意識して追うべき insurer だが、契約 underwriting entity としては standalone page が必要。

## 1. License / group boundary

The following table is scoped to public primary sources (fsa.go.jp, seiho.or.jp, taiju-life.co.jp). It restates licence / structure / product boundaries from those materials and does not invent market share, ranking, or unstated numerical claims. ^[source:fsa.go.jp; seiho.or.jp; taiju-life.co.jp]

| Item | Notes |
|---|---|
| Legal name | 大樹生命保険株式会社 |
| Historical name | 三井生命 |
| License route | Insurance Business Act life-insurance company; FSA life insurer list |
| Industry body | Life Insurance Association of Japan member |
| Wiki role | Traditional life-insurance operating company with group-adjacency watch |

## 2. Operating model

大樹生命は、traditional life-insurance products and sales channels を持つ operating insurer。FinWiki では [[life-insurers/nippon-life]]、[[life-insurers/meiji-yasuda]]、[[life-insurers/sumitomo-life]] などの large mutual insurers との関係性だけでなく、legacy brand / sales-force channel / product mix を分けて確認する。

大手生保 group の再編や提携は、保険契約者保護、solvency, distribution productivity, capital allocation に影響するため、単独の legal-entity anchor を置く。

## 3. Why this page matters

- FSA registry-confirmed life insurer absent from JapanFG standalone coverage.
- Important for tracking traditional life-insurance consolidation and group boundaries.
- Provides a route for future solvency and disclosure updates.

## Related

- [[life-insurers/nippon-life]]
- [[life-insurers/meiji-yasuda]]
- [[life-insurers/sumitomo-life]]
- [[life-insurers/asahi-life]]
- [[life-insurers/fukoku-life]]
- [[insurance/mutual-vs-stock-life-insurer]]

## Sources

- FSA: life-insurance company license list, as of 2026-04-13.
- Life Insurance Association of Japan: member-company list, as of 2026-04-13.
- 大樹生命 official website.