PROBLEM TO BE SOLVED: To provide a consciousness deterioration determining device capable of highly accurately determining a consciousness deteriorated state of a driver by taking account of an influence of disturbance in a normal steering state when determining a consciousness deterioration of the driver.SOLUTION: The consciousness deterioration determining device 1 according to the present invention includes: a normal steering quantity calculating section 51 for calculating a steering angle dispersion in a latest given time until a driver performs a steering operation, as a normal steering quantity; a steering deviation degree calculating section 55 for calculating a deviation degree of the steering quantity of the driver from the normal steering quantity by dividing a steering angle by the steering angle dispersion; a steering deviation degree determining section 56 for determining whether or not a steering deviation degree is a predetermined value or more; and a consciousness deterioration determining section 57 for determining that the driver is in the consciousness deteriorated state when the steering deviation degree is a predetermined value or more. This device 1 can reduce an erroneous detection and non-detection of a drowsy driving due to the influence of the disturbance in the normal steering state so as to highly accurately determine the consciousness deteriorated state.
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