appraiser; assessor; underwriter; auditor
A person who evaluates or assesses something, often in formal or professional contexts such as insurance, taxation, or auditing.
The insurance appraiser checked the extent of the damage.
税務署の査定者が帳簿を調べた。
The tax assessor examined the books.
評価者 is a general term for an evaluator or rater, often used in performance reviews or academic grading, whereas 査定者 implies a more formal or official assessment.
Compound of 査定 (assessment, appraisal) and 者 (person). The exact historical derivation is uncertain, but the word follows a common pattern for forming agent nouns in Japanese.