Patent ID: 8347697

Claim:
A surface texture measuring device comprising: a drive module configured to drive a stylus so that the stylus is traced along a surface of a measured substance in a state that the stylus is brought into contact with the surface of the measured substance; a stylus displacement detector configured to detect displacement of the stylus in a direction crossing a trace direction; a measurement module configured to measure surface texture of the measured substance based on the displacement amount of the stylus a threshold value storage module configured to store a threshold; a stylus move distance detector configured to detect a move distance in the trace direction of the stylus; a cumulative move distance storage module configured to cumulatively store the move distance of the stylus detected by the stylus move distance detector; and a notification module configured to make a comparison between the threshold value stored in the threshold value storage module and the cumulative move distance stored in the cumulative move distance storage module and to notify a user of replacement of the stylus when the cumulative move distance has exceeded the threshold value.