1A device for recording sound; historically often a tape recorder, but may also refer to digital recording devices.
学生時代に買った古い録音機を掃除したら、昔のテープが出てきた。
When I cleaned an old recorder I bought as a student, I found tapes from long ago.
インタビューは録音機で録って、後で文字起こしをする予定だ。
I'll record the interview with a recorder and transcribe it later.
録音機のマイクを被写体に近づけすぎないよう注意した。
Be careful not to place the recorder's microphone too close to the subject.