To provide a simple grinding device and a grinding method capable of grinding a surface of a grounded element with waviness along the waviness without computer controlling.

The grinding device includes (1) a rotating spindle, (2) a disc holder provided on a lower surface of the rotating spindle, and (3) an elastic pad attached to the disc holder and having (i) a curved end portion, (ii) a disc-shaped flexible plastic sheet attached to the elastic pad and having a diameter slightly larger than that of an elastomer elastic plate, and (iii) a multilayer element stuck to a lower surface of the plastic sheet and made from a sheet grinding wheel including a grinding abrasive layer having a diameter smaller than that of the plastic sheet.