A drive recorder includes a video recording unit that records a video captured by a camera mounted on a vehicle in association with the time of day, an abnormal event detection unit that detects an abnormal event, a time period determination unit that determines a time period that includes the time of day when the abnormal event is detected and that has a length determined based on a traveling condition other than the speed of the vehicle, a video extraction unit that extracts a video of the determined time period from the video recording unit, and a data saving unit that records, or transmits to an external device, a file including the extracted video as an erasure prohibited object.