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 individual difference 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 normal driving of a driver, 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 dispersion in the steering quantity of the driver so as to highly accurately determine the consciousness deteriorated state.;COPYRIGHT: (C)2013,JPO&INPIT
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