PROBLEM TO BE SOLVED: To provide a flatness measuring apparatus capable of detecting an inclination amount of a rotational axis of a spindle when the rotational axis of the spindle is inclined at the time of measurement, and improving measuring accuracy, based on the detected inclination amount of the rotational axis of the spindle.;SOLUTION: In a flatness measuring apparatus 10, a displacement amount D1 from a reference value of a spindle 20 detected by a first sensor 56 is subtracted from a displacement amount D2 from the reference value of the spindle 20 detected by a second sensor 58, and this displacement amount subtraction value is divided by a distance subtraction value obtained by subtracting a position R1 from a position R2. This allows an arithmetic processing part 46 to detect an inclination amount B. The arithmetic processing part 46 calculates the flatness of a workpiece 14 based on the detected inclination amount B and a displacement amount C of a probe 30 detected by a detector 32.;SELECTED DRAWING: Figure 2;COPYRIGHT: (C)2017,JPO&INPIT
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