A nail polisher for filing and polishing the finger nails by a motor drive. The nail polisher includes a polishing cylinder and filing plates. The polishing cylinder is lined with a polishing layer in its inner surface and is driven to rotate, while the filing plates are driven to reciprocate in horizontal. A motor is used as driving source for the rotatory motion of the polishing cylinder and for the reciprocatory motion of the filing plates. With the nail polisher structured as above, the filing of finger nails is carried out automatically, making the operation to be done quickly and easily. Furthermore, the nails are polished evenly with beautiful results.