Abstract: A method for manufacturing a ceramic reinforced piston and a molding machine therefor. A composite product composed of a cast product made of aluminum alloy or the like and shaped inorganic short fiber, particles or the like is obtained so that mechanical strength, wear resistance, heat resistance and the like of such composite product can be increased. Furthermore, mass production of such composite products becomes possible. A suitable amount of ceramic particles or a shaped inorganic short fiber is introduced in a casting mold, a molten metal such as an aluminum alloy and the like is then poured in the casting mold, and an upper punch is suitably pushed down on the molten metal to pressurize such molten metal in the casting mold. Push rams are additionally introduced laterally into the mold before or during the pouring of the molten metal to compensate for any shortage of molten metal and assure the metal penetrates the particles of fiber. The metal solidifies under pressure.