A method for manufacturing sliders from a bar has: a radiating step which includes radiating an electromagnetic wave on at least a part of each space on a second surface of said bar, wherein said second surface is a back surface of a first surface of said bar, said first surface being formed into an air bearing surface of said slider, wherein said space is sandwiched between said elements, and wherein said electromagnetic wave is radiated such that an entire portion of said bar forms a curved shape such that said first surface forms a convex surface; a lapping step of lapping said first surface while pressing said bar against a lapping surface such that said first surface of each element forms a concave shape; and a dicing step of dicing said bar along said spaces to separate said bar into said sliders.