PROBLEM TO BE SOLVED: To provide a thickness measurement device capable of further accurately evaluating thickness to the perimeter of piping.SOLUTION: A thickness measurement device comprises a plurality of ultrasonic probes for detecting thickness of piping 1, a first feed amount measurement device for measuring a first feed amount which is a feed amount in a circumferential direction Y of the piping 1 and a second feed amount measurement device for measuring a second feed amount which is a feed amount in a pipe axial direction X of the piping 1. The plurality of ultrasonic probes are arrayed in a zigzag manner in the pipe axial direction X of the piping 1. The array length is set to be longer than a feed pitch P in the pipe axial direction X obtained by making a round of the piping 1 in the circumferential direction Y. The thickness measurement device comprises a measurement position computation unit 17 for computing a position of thickness measurement by the ultrasonic probes on the basis of a measurement result from the first feed amount measurement device and a measurement result from the second feed amount measurement device.SELECTED DRAWING: Figure 7
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