To provide a mobile robot capable of precisely and efficiently moving while suppressing increase in a processing load.

This mobile robot is provided with a map information storage means 120 storing an arc serving as a path capable of detecting a landmark and the landmark detectable by the arc in association with each other, a landmark detection means 106 detecting presence/absence of a landmark at a predetermined positional interval, a robot position specification means 100 specifying a position of the mobile robot in detection of the landmark if the detected landmark is not that associated with the arc by the map information storage means 120, and a map information update means 110 newly storing the arc generated based on the position of the robot and the landmark in the map information storage means 120 in association with each other.

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