The living body state estimation device 1 comprises: a physiological information detection unit 2 having a physiological information feature amount calculation unit 22 that calculates physiological information feature amounts on the basis of physiological information of a driver 11 acquired by sensors 21; a facial expression detection unit 3 having a facial expression feature amount calculation unit 32 that calculates facial expression feature amounts on the basis of facial expression information extracted from images of the driver's 11 face captured by a camera 31; a state estimation unit 4 that estimates the state of the driver 11 on the basis of the physiological information feature amounts and the facial expression feature amounts; and a physical stimulus generation unit 5 that generates a physical stimulus to be provided to the driver 11. The state estimation unit 4 acquires changes in physiological information feature amounts and changes in facial expression feature amounts before and after a physical stimulus generated by the physical stimulus generation unit 5 is provided, and based on said changes, carries out weighting of the physiological information feature amounts and the facial expression feature amounts when estimating the state of the driver 11.
LIVING BODY STATE ESTIMATION DEVICE