Route Search Device, Server Device and Navigation Device

A route search device, comprising:

• map data of a road map;
• a derived route acquisition section that acquires a first derived route for a mobile body from an origin point of the mobile body to a destination of the mobile body;
• a route correction region acquisition section that acquires a route correction region corresponding to the first derived route;
• a place to be passed through setting section that sets a place to be passed through in the route correction region;
• a start point and end point setting section that sets a start point and an end point in the route correction region;
• a corrected route acquisition section that acquires a corrected route, not included in the first derived route, from the start point and passing through the place to be passed through to arrive at the end point;
• and
• a route correction section that corrects the first derived route to a second derived route from the origin point to the destination, constituted by a route from the origin point to the start point, the corrected route, and a route from the end point to the destination.