[Object] To provide a sputtering apparatus, a thin-film forming method, and a manufacturing method for a field effect transistor, which are capable of reducing damage of a base layer.[Solving Means] The sputtering apparatus 100 includes a conveying mechanism, a first target Tc1, a second target (Tc2 to Tc5), and a sputtering means. The conveying mechanism conveys a supporting portion, which is arranged in an inside of a vacuum chamber and supports a substrate, linearly along a conveying surface parallel to the surface to be processed of the substrate. The first target Tc1 is opposed to the conveying surface with a first space therebetween. The second target (Tc2 to Tc5) is arranged on a downstream side in a conveying direction of the substrate with respect to the first target Tc1, and is opposed to the conveying surface with a second space smaller than the first space therebetween. The sputtering means sputters each target. According to this sputtering apparatus 100, the damage received by the base layer is small, and hence it is possible to form a thin-film having good film-forming properties.