The invention provides a navigation device and a guide route planning method, and the device and method can achieve the planning of a route which enables a time period of automatic driving and a timeperiod of appointment event execution in a running process of a vehicle to be consistent with each other as much as possible. The navigation device is provided with a vehicle position obtaining part for obtaining the position of the vehicle and a destination setting part; an appointment event part which obtains the information: an appointment event and the start and end time set for the event; a route planning part which explores a route which has at least one segment of automatic driving in the running route of the vehicle between the start time and the end time from a departure place to a destination; a guide route determining part which takes the specific route explored by the route planning part as a guide route; and a display part which displays the guide route.