Driver state detection device

A driver state detection device comprising:

• an acceleration sensor installed in a vehicle;
• a center-of-gravity movement amount detection unit that is attached to a component constituting the vehicle and detects a center-of-gravity movement amount of a body of a driver on the vehicle;
• a driver state determination unit that determines a state of the driver based on magnitude of an amount of deviation between an acceleration of the vehicle obtained by the acceleration sensor and the center-of-gravity movement amount of the body of the driver detected by the center-of-gravity movement amount detection unit;
• and
• an error signal generation unit including an adaptive filter that updates a filter coefficient to reduce a value of an error signal indicating a difference between a filter output obtained by convolution of the center-of-gravity movement amount of the driver detected by the center-of-gravity movement amount detection unit and the filter coefficient and the acceleration of the vehicle obtained by the acceleration sensor, wherein
• an amount of deviation between the acceleration of the vehicle and the center-of-gravity movement amount of the driver is indicated by the filter output from the adaptive filter or the value of the error signal.