noun
respondent; person who answers
Refers to a person who responds to a survey, questionnaire, inquiry, or question. Common in formal and research contexts.
アンケートの回答者は500人を超えた。
The number of survey respondents exceeded 500.
回答者の多くが賛成と答えた。
Most of the respondents answered that they agreed.
解答者 is a person who solves a problem or gives a solution, often used in test or puzzle contexts, whereas 回答者 is broader and used for surveys and inquiries.
Compound of 回答 (answer, reply) + 者 (person).