Map creation device

The present invention provides a map creation device with which it is possible to improve the accuracy of extracting the boundary of a workplace in travelable map information. The present invention is provided with: a map information storage unit 18 for storing map data 18A that indicates an area in which a dump truck 7 can travel; a work machine information accumulation unit 19 for accumulating position data 6A and operation data 6B about a hydraulic shovel 6; an operation area arithmetic processing unit 21 for calculating the operation area of the hydraulic shovel 6 on the basis of the position data 6A and operation data 6B accumulated in the work machine information accumulation unit 19; and a map information update unit 22 for collating the operation area of the hydraulic shovel 6 as calculated by the operation area arithmetic processing unit 21 against the map data 18A stored in the map information storage unit 18, thereby correcting the boundary 18a of a loading place 1 in the map data 18A and updating the map data 18A.