To provide an inexpensive and safety polisher for floor cleaning, enabling even nonexperts to easily perform floor surface polishing work without increasing greatly the number of component items of the polisher.

The polisher 1 for floor cleaning has a machine 7 to which a motor 14 is mounted, and a cleaning implement 5 provided at a lower end of the machine 7. The polisher 1, more specifically, includes: a wheel holder 12 vertically movably supported by the machine 7; a wheel 10 axially supported by the wheel holder 12 to make contact with the floor surface FL during floor cleaning; and an biasing means 16 installed between the machine 7 and the wheel holder 12 to bias the wheel 10 to the floor surface FL side while transforming by following change in a wear status of the cleaning implement 5.