To provide a floor surface polisher for which the vertical movement of a pad to a floor surface can automatically be performed, a contact pressure to the floor surface can easily be adjusted, a large change in the number of rotation of a pad does not occur even when the contact pressure to the floor surface is changed, and a safety remedy such that when the contact of a brush to the floor surface is abnormal, the pad is automatically separated from the floor surface and is raised is taken.

For this floor surface polisher 1, a vertically movable bracket 12 which is always elastically supported in a separating direction from the floor surface F by a compression spring 14 is provided in the machine body, and on the vertically movable bracket 12, a motor base 9 to which a motor MT and a pad 20 being rotated by the motor MT are attached is fitted. This floor surface polisher 1 is constituted in such a manner that a pad pressure adjusting lever 15 which vertically moves the vertically movable bracket 12 together with the pad 20 and the motor MT by the operation of a manual operation lever 8 or by the traction of a tension spring 23 by the action of an actuator is provided on the motor base 9 and the vertically movable bracket 12.