A recording device (1, 101, 201) for vehicles comprising: a video data acquisition unit configured to acquire: video data collected from a camera imaging an area around an own vehicle, and first sound data collected from an in-cabin microphone inside a vehicle cabin of the own vehicle; a sound volume detection unit (32, 132) configured to detect a sound volume of an audio sound played back in the own vehicle; and a recording control unit (34, 134) configured to loop record, into a recording unit, video-sound data including the first sound data by which the sound volume of the played back audio sound can be determined and second sound data on which an effect of the played back audio sound is small, when the sound volume of the played back audio sound is greater than a predetermined sound volume, wherein the recording control unit is further configured to loop record video-sound data including only first sound data when the sound volume of the played back audio sound is less than or equal to the predetermined sound volume, and wherein the second sound data is at least one of: collected outside the vehicle cabin of the own vehicle from an out-of-cabin microphone by the video acquisition unit, and obtained by cancelling, by a cancellation processing unit of the recording device for vehicles, the played back audio sound from the first sound data based on an audio signal acquired from an audio device outputting the played back audio sound. a video data acquisition unit configured to acquire: video data collected from a camera imaging an area around an own vehicle, and first sound data collected from an in-cabin microphone inside a vehicle cabin of the own vehicle; a sound volume detection unit (32, 132) configured to detect a sound volume of an audio sound played back in the own vehicle; and a recording control unit (34, 134) configured to loop record, into a recording unit, video-sound data including the first sound data by which the sound volume of the played back audio sound can be determined and second sound data on which an effect of the played back audio sound is small, when the sound volume of the played back audio sound is greater than a predetermined sound volume, wherein the recording control unit is further configured to loop record video-sound data including only first sound data when the sound volume of the played back audio sound is less than or equal to the predetermined sound volume, and wherein the second sound data is at least one of: collected outside the vehicle cabin of the own vehicle from an out-of-cabin microphone by the video acquisition unit, and obtained by cancelling, by a cancellation processing unit of the recording device for vehicles, the played back audio sound from the first sound data based on an audio signal acquired from an audio device outputting the played back audio sound. collected outside the vehicle cabin of the own vehicle from an out-of-cabin microphone by the video acquisition unit, and obtained by cancelling, by a cancellation processing unit of the recording device for vehicles, the played back audio sound from the first sound data based on an audio signal acquired from an audio device outputting the played back audio sound.