Traffic accident data recorder and traffic accident reproduction system

One kind of traffic accident data recorder 1 comprises an acceleration sensor 3, comprising an angular velocity sensor 4 if necessary, a memory 8 and a control section for controlling the recording process of the memory 8 7. When the data output of the acceleration sensor 3 or angular velocity sensor 4 exceeds a predetermined value, the control section 7 to ascertain the time of the traffic accident occurrence time, the acceleration data and angular velocity data before and after the accident or incident and stored in the memory 8 in. The data reproduction system by analyzing traffic accident data, can reproduce the state of the traffic accidents.