noun
life insurance company
Refers to a company that provides life insurance policies.
彼は大手の生命保険会社に勤めている。
He works for a major life insurance company.
損害保険会社 is a non-life (property and casualty) insurance company, while 生命保険会社 specifically handles life insurance.
Compound of 生命 (life), 保険 (insurance), and 会社 (company).