PURPOSE: To obtain two types of three-color products by one set of molds and one molding machine by circumferentially equidistantly providing first, second and third color cores and cavities of first and second products in a core base and a cavity base, sequentially rotating at specific angle, and injection first to third color resins.

CONSTITUTION: The cores 20, 30 of buttons 1, 5 are circumferentially equidistantly set at positions X, Y and Z of an angle of 120° at a core base 11, and first, second and third color cavities are respectively formed corresponding to the cores 20, 30 in the cavity base 12. The patterns of buttons 1 and 5 are molded by pin gates at the position X by transparent first color resin. Then, the body of the button 1 and the character of the button 5 are respectively molded at the position Y by second color resin. Thereafter, the core back type core of the button 1 is fed back and the character of the button 1 and the body of the button 5 are respectively molded with third color resin at the position X.