MAP INFORMATION CORRECTION METHOD, DRIVING ASSISTANCE METHOD, AND MAP INFORMATION CORRECTION DEVICE

A map information correction method for correcting map information including information of a lane boundary line (20L, 20R), the method including: detecting a position with respect to an own vehicle (1) of a lane boundary line (20L, 20R) set in place on a road surface around the own vehicle (1) ; estimating an own position on a map of the own vehicle (1); and correcting, depending on the estimated own position and the detected position of the lane boundary line (20L, 20R), a position of the lane boundary line (20L, 20R) included in the map information by, in a first region (24) comparatively close to the own vehicle (1), a larger rotational correction amount (R) than in a second region (25) comparatively far from the own vehicle (1) and, in the second region (25), a larger translational correction amount (M) than in the first region (24).