Manufacturing method of resin molded assembly

A method of manufacturing a resin molded assembly, said method comprising the steps of:

• molding first and second resin molded articles in a metal mold composed of a first mold, a second mold opposed to said first mold, said second mold being movable in a first direction toward said first mold, a pair of housing molds for forming the first resin molded article, said pair of housing molds being slidable in a second direction perpendicular to said first direction, and a pair of retainer molds for forming the second resin molded article, said pair of retainer molds being slidable in a third direction perpendicular to said first and second directions;
• removing said pair of housing molds located between the first resin molded article and the second resin molded article to form a space;
• moving said pair of retainer molds located aside of the second resin molded article, while the first resin molded article is held;
• and
• pressing the second resin molded article against the first resin molded article to provisionally fit the second resin molded article with the first resin molded article and form the resin molded assembly.