A driver state determination apparatus that is mounted on an automobile, the driver state determination apparatus comprising: a voluntary function recognition section that recognizes whether a driver's voluntary function works normally in order to detect a prediction of outbreak of abnormality of the driver; and an involuntary function recognition section that recognizes whether an involuntary function works normally on the basis of a fact that the involuntary function remains in an abnormal state for a specified time or longer, wherein in the case where it is recognized that the voluntary function does not work normally, the specified time required to recognize whether the involuntary function works normally is reduced compared to a case where the abnormality of the driver is determined only on the basis of the involuntary function, characterized in that the voluntary function recognition section includes: a high voluntary function recognition section that recognizes whether a high voluntary function works normally on the basis of a saccade reaction against saliency or movement of the line of sight of the driver; and a low voluntary function recognition section that recognizes whether a low voluntary function as a lower voluntary function than the high voluntary function works normally, in the case where it is recognized that the high voluntary function does not work normally, determination criteria of the low voluntary function recognition section and/or the involuntary function recognition section are changed, and in the case where it is recognized that the low voluntary function does not work normally, the determination criterion of the involuntary function recognition section is changed. a voluntary function recognition section that recognizes whether a driver's voluntary function works normally in order to detect a prediction of outbreak of abnormality of the driver; and an involuntary function recognition section that recognizes whether an involuntary function works normally on the basis of a fact that the involuntary function remains in an abnormal state for a specified time or longer, wherein in the case where it is recognized that the voluntary function does not work normally, the specified time required to recognize whether the involuntary function works normally is reduced compared to a case where the abnormality of the driver is determined only on the basis of the involuntary function, a high voluntary function recognition section that recognizes whether a high voluntary function works normally on the basis of a saccade reaction against saliency or movement of the line of sight of the driver; and a low voluntary function recognition section that recognizes whether a low voluntary function as a lower voluntary function than the high voluntary function works normally, in the case where it is recognized that the high voluntary function does not work normally, determination criteria of the low voluntary function recognition section and/or the involuntary function recognition section are changed, and in the case where it is recognized that the low voluntary function does not work normally, the determination criterion of the involuntary function recognition section is changed.