noun
claimant; requester
A person who formally or officially requests or demands something, such as a service, right, or information.
情報開示の要求者は、所定の用紙に記入してください。
The requester of information disclosure should fill out the prescribed form.
保険金の要求者は、事故証明を提出する必要がある。
The claimant for insurance money must submit an accident report.
依頼者 is a client or person who entrusts a task to someone, whereas 要求者 focuses on the act of requesting or demanding something specific.
Compound of 要求 (request, demand) and 者 (person). The reading is standard on'yomi.