To provide a thread guide wear testing machine (1) allowing a wear test using a thread (3) to be conducted stably.The present invention relates to a thread guide wear testing machine (1) for wearing a test piece (2) by causing a thread (3) to slide while the thread (3) is in contact with the test piece (2). The thread guide wear testing machine (1) includes a winding reel (12) usable for winding the thread (3) thereon fed from thread feeding means (4). A winding drum (13) for guiding the thread (3) fed from the thread feeding means (4) to the winding reel (12) is provided. The winding drum (13) has an outer peripheral surface in contact with an outer peripheral surface of the winding reel (12). Specimen holding means (35) is provided on a path of the thread (3) fed from the thread feeding means (4) and moving while being wound on the winding reel (12). The specimen holding means (35) holds the test piece (2) in a state of contacting the thread (3) under a predetermined load. Tension adjusting means is provided for adjusting tension on the thread (3) with which the test piece (2) is in contact. Contact retaining means (24) is further provided for retaining a state of contact between the winding reel (12) and the winding drum (13) by pressing the winding reel (12) toward the winding drum (13) .
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