A device for detecting a state of a vehicle operator includes a first vibration detection unit installed on a vehicle side and configured to detect vibration, a second vibration detection unit installed on a steering part of the vehicle and configured to detect vibration, and a controller configured to process and compute input signals from the first vibration detection unit and the second vibration detection unit. The controller determines a gripping state of the steering part based on a difference between the respective input signals of the first vibration detection unit and the second vibration detection unit.
