PROBLEM TO BE SOLVED: To provide technique for determining a thickness by which the thickness of a workpiece highly accurately managed without requiring highly skilled work.
SOLUTION: The grinding device 100 for grinding the workpiece has a first grinding member 111, a second grinding member 121 arranged oppositely to the first grinding member via the workpiece 101, and a driving means which relatively rotates or oscillates the first grinding member and the second grinding member. The device 100 also has: detecting means 114, 117, which measure the position of a device structure part changed with the changes of the thickness of the workpiece and detects whether the detected value of the thickness corresponding to the thickness below a setting value of the thickness of the workpiece is obtained; and a clocking means which calculates the duration of continuously obtaining the detected value of the thickness corresponding to the thickness below the setting value. The device 100 is composed so that grinding operations are stopped when the duration exceeds a prescribed setting time.
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