A board working device includes an adjustment mechanism including a plurality of main legs provided on a bottom portion of a base, the main legs being capable of adjusting a position of the base in vertical directions, and bolt heads for operating the main legs, a mounting head which rotates the bolt heads and adjusts the position of the base in the vertical directions, and a moving device which moves a mounting head to an arbitrary position on the base, in which the bolt heads are arranged within a movement range of the mounting head according to the moving device. Accordingly, it is possible to automatically perform leveling of the base using the mounting head, and it is possible to appropriately and swiftly perform the leveling of the base regardless of proficiency of an individual worker.