BRAKE STATE ESTIMATION DEVICE AND VEHICLE EQUIPPED THEREWITH, BRAKE STATE ESTIMATING METHOD, AND RECORDING MEDIUM STORING PROGRAM

A brake state estimation device includes: a position acquisition section that acquires a position of a subject vehicle; and a state estimation section that estimates a state of deterioration of brake fluid for operating a hydraulic brake device of the subject vehicle, on the basis of humidity information corresponding to the position of the subject vehicle, and duration information expressing a duration of staying in an area that includes the position of the subject vehicle.