The invention provides a driver condition estimation device and a driver condition estimation method, which can quickly and accurately capture abnormal omen of a driver that cannot drive. The driver condition estimating device includes a head movement measuring unit (21) and a detector (30). The head movement measuring unit measures movement of the head of a driver from output of a driver camera (10) that photographs the driver. The detector detects a sign of abnormality of the driver from the movement of the head measured by the head movement measuring unit (21). The detector (30) determines existence of the sign of abnormality of the driver in a case in which lateral acceleration acting on the head of the driver is a predetermined value or less, by these processes: calculation of a periodic feature amount from time series data showing the movement of the head of the driver, calculation of a time series variation pattern from the obtained periodic feature amount, and comparison of the obtained time series variation pattern with a predetermined threshold.
DRIVER CONDITION ESTIMATING DEVICE, AND DRIVER CONDITION ESTIMATING METHOD