To provide a spinning method having high degree of freedom.

Rolls 32-24 are pressed on the outer circumference of a tubular member 1, and revolved relatively to the tubular member 1 to form a small diameter portion by spinning. The rolls 32-24 are relatively revolved concentric with the center in the longitudinal direction of the tubular member 1, and the small diameter portion is formed by implementing one reciprocation of the roll 32 in the radial direction of the tubular member around the center of revolution for one revolution.