noun
A person or entity legally or officially entrusted with the care, management, or safekeeping of property, assets, or records.
彼は遺言で指定された保管人です。
He is the custodian designated in the will.
信託財産の保管人としての責任は重い。
The responsibility as a trustee of the trust property is heavy.
受託者 is a 'trustee' in the context of a trust agreement, emphasizing the fiduciary duty. 保管人 can be a trustee but also a custodian without full fiduciary powers.
Compound of 保管 (ほかん, 'custody, safekeeping') and 人 (にん, 'person'). The exact historical derivation is uncertain, but the word follows a common pattern for forming agent nouns.