A tensile tester includes a tester body having at least one detector and a controller, and the controller includes a first branch setting unit that sets a first branching condition at a first branch point at which a test condition branches into two or more test conditions in association with a detection result of the detector, a first condition setting unit that sets a first test condition that is a test condition before the first branch point, and a second condition setting unit that sets a second test condition that is a test condition after the first branch point.