Method for manufacturing composite molded article and composite molded article

A method for manufacturing a composite molded article in which a first molded portion formed by a flat plate-like first member which is softened under heating and a second molded portion formed by hardening molten resin are integrally molded, the method comprising:

• opening a molding mold that forms a molding space by mold closing and has a weir portion projecting into the molding space,
• arranging the flat plate-like first member softened under heating in a part of a portion where the molding space is formed,
• forming the first molded portion that is stereoscopic with the mold closing,
• simultaneously filling an injected molten resin in a remaining portion of the molding space around the first member outside the weir portion in a state that the weir portion is made to abut against a thin portion reduced in thickness and provided at a peripheral edge of the first molded portion, and
• forming the second molded portion that is joined to the first molded portion by hardening molten resin after the resin is caused to contact the first molded portion,
• wherein the thin portion is a portion formed by compressing the first member and has a higher density than that of portions other than the thin portion in the first molded portion.