Provided is a device for detecting the movement of a flexible telescopic pipe joint capable of electrically detecting the positional relationship between a first pipe and a second pipe relative to a telescopic flexible pipe joint electrically. The movement probe 33 of the expansion joint pipe joint is constructed so that the first pipe position 15 of the first pipe 1 and the first reference position 16 of the sleeve 4 of the expansion joint pipe joint 3, (11) constituted by a plurality of sets of first measurement ports (12) for measuring a first distance variation, which is a variation of the distance between the first and second piping positions (17, And a second measurement group (13) in which a plurality of sets of second measurement ports (14) for measuring a second distance variation amount, which is a variation amount of the distance between the sleeve and the second reference position (18), are provided. The plurality of first measurement ports 12 are disposed at different positions in the circumferential direction of the sleeve 4 and the plurality of second measurement ports 14 are disposed at different positions in the circumferential direction of the sleeve 4, The displacement positions of the first pipe 1 and the second pipe 2 with respect to the expansion joint pipe joint 3 are calculated from the measurement data by the measurement group 11 and the measurement data by the second measurement group 13 .
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