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Business Term

エンジェル投資家

Angel Investor / エンジェル・インベスター

An angel investor is an individual who invests personal capital in early-stage startups and often provides mentoring and connections.

Use when
Guides whether to raise early external capital or bootstrap the first milestones.
Watch out
Angel money is not always “easy”; it still requires trust and due diligence.
Updated: 2026. 05. 14.Quality: ReviewedSources: 3
What it means

Angel investors typically fund startups before institutional venture capital, taking equity in exchange for high risk capital. They may contribute industry expertise, credibility, and access to networks in addition to money. The concept helps founders evaluate funding sources, expected terms, and the non-financial value an investor can add.

When it helps

Guides whether to raise early external capital or bootstrap the first milestones. Shapes deal terms such as valuation, dilution, and investor rights for the seed round. Influences how much strategic guidance and network access the company can leverage.

  • Guides whether to raise early external capital or bootstrap the first milestones.
  • Shapes deal terms such as valuation, dilution, and investor rights for the seed round.
  • Influences how much strategic guidance and network access the company can leverage.
How to use it
  • Angels often fund the earliest validation stage when risk is highest.
  • The right angel can open doors to customers, talent, or later investors.
  • Clear expectations on involvement prevent micromanagement or misalignment.
  • Seed terms affect future fundraising, so negotiate with long-term impact in mind.
  • Diverse angels can reduce single-point dependency and add varied expertise.
Example

A founder developing a medical scheduling app needs $200k to complete regulatory testing. Instead of a bank loan, she raises from three angels who have healthcare backgrounds. They help introduce pilot clinics and review compliance plans while taking a small equity stake. The founder sets clear boundaries on decision rights and uses the capital to reach the next funding milestone.

Compare with

Compare Angel Investor with adjacent concepts before deciding. Angel Investor | Current concept | Use when the team needs the primary decision lens Adjacent metric or framework | Supporting lens | Use when the team needs evidence or process detail General vocabulary | Broad explanation | Use only for orientation, not final decision-making

MetricDifferenceWhy read together
Angel InvestorCurrent conceptUse when the team needs the primary decision lens
Adjacent metric or frameworkSupporting lensUse when the team needs evidence or process detail
General vocabularyBroad explanationUse only for orientation, not final decision-making
Common mistakes
  • Angel money is not always “easy”; it still requires trust and due diligence.
  • A famous angel does not guarantee traction; product-market fit is still required.
  • Angels do not always stay passive; some expect active advising or oversight.
Frequently asked questions
When should I use Angel Investor?

Use it when the team needs to decide scope, priority, owner, or trade-off, not when it only needs a short definition.

What makes Angel Investor useful in practice?

It becomes useful when it is tied to evidence, a decision owner, and a concrete next operating choice.

What should I avoid?

Avoid using the term as a label without clarifying assumptions, boundaries, and how success will be judged.

Sources
SourcesKindLink
Entrepreneurship (OpenStax)Open
Principles of Marketing (Open Textbook Library)tier_sOpen
Principles of Management (OpenStax)tier_sOpen