The present invention improves estimation accuracy when the resting state of a driver is estimated. The heart rate (R) of a driver is recorded, and a deceleration start point (tg) when a vehicle in a traveling state starts to decelerate and stops. With reference to heart rates (R) within a predetermined period recorded before the deceleration start point (tg) by a living organism information recording unit (21), a pre-deceleration heart rate (Rb) that is the representative value of the heart rates (R) to which the reference was made is extracted. With reference to heart rates (R) within a predetermined period recorded after the deceleration start point (tg) by the living organism information recording unit (21), a post-deceleration heart rate (Ra) that is the representative value of the heart rates (R) to which the reference was made is extracted. The pre-deceleration heart rate (Rb) and the post-deceleration heart rate (Ra) extracted by a living organism information extraction unit (23) are compared to estimate the resting state of the driver after the deceleration. More specifically, when the difference ([delta]R) between the pre-deceleration heart rate (Rb) and the post-deceleration heart rate (Ra) is a predetermined threshold value (Rt) or more, it is estimated that the driver is in a resting state after the deceleration.