Provided is a filament path wear tester (1) capable of reliably carrying out wear testing using a filament (3). The present invention relates to a filament path wear tester (1) for wearing a test piece (2) by sliding a filament (3) along the test piece (2) in a state where the filament (3) is in contact with the test piece (2). This filament path wear tester (1) is provided with a winding reel (12) capable of winding the filament (3) from a filament supply means (4). A winding drum (13) is provided for guiding the filament (3) from the filament supply means (4) to the winding reel (12). The outer circumferential surface of the winding drum (13) is in contact with the outer circumferential surface of the winding reel (12). On the path of the filament (3), which moves by being wound from the filament supply means (4) by the winding reel (12), a sample holding means (35) is provided for holding the test piece (2) in a state of pressing the filament (3) in contact with same with a prescribed load. A tension adjustment means is provided for adjusting the tension of the filament (3) in contact with the test piece (2). A contact maintaining means (24) is provided for maintaining the state of contact between the winding reel (12) and winding drum (13) by pressing the winding reel (12) toward the winding drum (13).