Disclosed is a tire tester (1) provided with: a device frame (3); a slide base (10) provided on the device frame (3) so as to be able to move up and down; a large spindle (11) that is attached to the slide base (10) and can rotatably support a large-diameter tire (T1); and a small spindle (12) that is attached to the slide base (10) and can rotatably support a small-diameter tire (T2) that is smaller than the large-diameter tire (T1). The disclosed tire tester (1) can push one of the tires (T1 or T2) against a simulated road surface (5), by means of the up/down movement of the slide base (10), and perform a tire test.
