To provide an RTM molding method for obtaining an excellent molded product free from pinholes or voids.

A preform obtained by shaping a fiber reinforcing material into a molded product shape or a sheetlike fiber reinforcing material 5 are arranged in a mold composed of an upper mold 1 and a lower mold 2 and, after the mold is clamped, the cavity formed of the upper mold and the lower mold is evacuated, a resin is injected in the cavity to impregnate the fiber reinforcing material and the impregnated fiber reinforcing material is cured. In this resin transfer molding method, the resin is first injected in the cavity under pressure, a part of the injected resin is subsequently sucked and the resin is next again injected under pressure.