A manufacturing method of a fiber reinforced composite material comprising: fixing a fiber-based material on a first mold such that peripheral portions of the fiber-based material are sandwiched by surfaces of the first mold to restrict the movement of the fiber-based material in an extending direction thereof and such that an opening for a first surface of the fiber-based material is provided, wherein the first mold includes a first member which has a surface on which the fiber-based material to be molded is placed, a second member which is arranged to surround the fiber-based material to restrict the movement of the fiber-based material in the extending direction, and a third member which is placed on the second member and a part of the third member extends onto the fiber-based material such that the fiber-based material is sandwiched and fixed by the first mold at the end portions and a surface portion of the fiber-based material not covered by the third member is defined as the first surface; setting a second mold having a second surface on the first mold such that a side portion slidably contacts the third member and such that the second surface faces the first surface through a sealed space defined by the third member and by the first and second surfaces (18,19); filling resin into the sealed space; and relatively moving said second mold toward said first mold to bring the second surface closer to the first surface, such that the fiber-based material is impregnated with the resin through the first surface, wherein said filling comprises reducing a pressure inside the space through a resin ejection line connected to said space and ejecting an excessive amount of resin through the resin ejection line from a side portion of the fiber-based material. fixing a fiber-based material on a first mold such that peripheral portions of the fiber-based material are sandwiched by surfaces of the first mold to restrict the movement of the fiber-based material in an extending direction thereof and such that an opening for a first surface of the fiber-based material is provided, wherein the first mold includes a first member which has a surface on which the fiber-based material to be molded is placed, a second member which is arranged to surround the fiber-based material to restrict the movement of the fiber-based material in the extending direction, and a third member which is placed on the second member and a part of the third member extends onto the fiber-based material such that the fiber-based material is sandwiched and fixed by the first mold at the end portions and a surface portion of the fiber-based material not covered by the third member is defined as the first surface; setting a second mold having a second surface on the first mold such that a side portion slidably contacts the third member and such that the second surface faces the first surface through a sealed space defined by the third member and by the first and second surfaces (18,19); filling resin into the sealed space; and relatively moving said second mold toward said first mold to bring the second surface closer to the first surface, such that the fiber-based material is impregnated with the resin through the first surface, wherein said filling comprises reducing a pressure inside the space through a resin ejection line connected to said space and ejecting an excessive amount of resin through the resin ejection line from a side portion of the fiber-based material.