On-vehicle navigation apparatus and turnoff road guiding method

An on-vehicle navigation apparatus (50) includes a current location calculator (21) calculating a current location of an own vehicle, a map information database (2) storing map information including road map data, a driving lane specifying section (23) detecting a lane change in response to an operation signal from a winker and specifying a driving lane of the own vehicle, and a guidance-timing controller (24) detecting a turnoff road ahead of the own vehicle in a traveling direction and conducting turnoff road guidance on a driver at a forward position distanced from the detected turnoff road depending on a location of the specified driving lane of the own vehicle.