PROBLEM TO BE SOLVED: To provide a hyperprosexia state determination device capable of highly accurately determining a hyperprosexia state of a determination object person regardless of an error due to installation position of an object detection device and a measurement error in a visual line direction.SOLUTION: On the condition that the visual line direction of a driver is directed to a direction of one specific object for a prescribed time and an angular velocity θev in the eyeball direction is equal to or less than a first threshold Th1 representing that no saccade occurs, the hyperprosexia state determination device determines that the driver is in the hyperprosexia state where the visual line of the driver is directed to the specific object.SELECTED DRAWING: Figure 6
