PROBLEM TO BE SOLVED: To provide a behavior survey device of a telescopically flexible pipe joint capable of detecting electrically and surely a positional relation of a first pipe and a second pipe to the telescopically flexible pipe joint.;SOLUTION: A control part 33a of a behavior survey device 10 of a telescopically flexible pipe joint forms a first virtual right-angled triangle 51 for showing a positional deviation amount between a first pipe 1 and a sleeve 4 based on measurement data from a first measuring tool 12. Then, an inclination of the first pipe 1 and a deviation amount on the center line 1c are determined based on the first virtual right-angled triangle 51.;SELECTED DRAWING: Figure 12A;COPYRIGHT: (C)2018,JPO&INPIT
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