Rare term; refers to a person or organization that can provide a reference or background check, often in employment contexts. The cross-reference 照会先 is more common.
See also: 照会先
There is a field on the resume to fill in a reference.
More common and general term for a reference or inquiry contact; 身元照会先 specifically emphasizes personal identity or background checking.
Compound of 身元 (identity, background) + 照会先 (inquiry/reference contact).