interviewee; interview subject
Refers to the person being interviewed by a reporter or researcher. Common in journalistic contexts.
The reporter politely asked the interviewee questions.
The interview was postponed due to the interviewee's schedule.
取材 means 'news gathering' or 'interviewing' as an activity; 取材相手 specifically refers to the person being interviewed.
インタビュー is a more general term for an interview, while 取材相手 is a specific term for the person being interviewed in a journalistic context.
Compound of 取材 (news gathering, interviewing) and 相手 (partner, other party).