A bottle-shaped can manufacturing method for forming a shoulder portion having a slope and a diametrically small cylindrical neck portion integrally by further working a bottom side of a bottomed cylindrical can which is formed thinner at its trunk wall than at its bottom wall by drawing a metallic sheet having a thickness of 0.1 to 0.4 mm and by executing at least one thinning working of a bending/extending working and an ironing working. This method comprises: a first diametrically small cylindrical portion forming step of drawing the bottom and the trunk of the can into a diametrically smaller bottomed cylindrical shape than the trunk portion, and forming a bottom corner portion of the can into a curved face (or a curved shoulder face) having an arcuate longitudinal section, with the curved face of the bottom corner portion and the curved face being unwrinkled; a second diametrically small cylindrical portion forming step of re-drawing the bottomed cylindrical portion drawn into a diametrically smaller bottomed cylindrical shape at the previous step, with the bottom corner portion being unwrinkled by the surface of a tool; and a shoulder portion reforming step of pushing and extending the shoulder portion, which is formed by the first diametrically small cylindrical portion forming step and the second diametrically small cylindrical portion forming step into a smooth slope leading to the curved shoulder face on the trunk side, after the diameter of the bottomed cylindrical portion formed by executing the drawing working of the second diametrically small cylindrical portion forming step once or two or more times becomes substantially equal to a diameter of the neck portion.