ESTIMATION DEVICE, ESTIMATION METHOD, PROGRAM PRODUCT FOR ESTIMATION

An estimation includes a dead reckoning unit, a map matching unit, and a parameter correction unit. The dead reckoning unit is configured to estimate a state quantity by dead reckoning based on (i) a dynamics model including a parameter that changes a behavior of the vehicle and (ii) internal information acquired from an inside of the vehicle. The map matching unit is configured to observe the state quantity by map matching based on (i) map information indicative of a traveling environment of the vehicle and (ii) external information acquired from an outside of the vehicle. The parameter correction unit is configured to correct the parameter, which is to be fed back for the dead reckoning, based on an offset amount that is a difference between the state quantity observed by the map matching and the state quantity estimated by the dead reckoning.