Abstract: A production method of an insert-molded product according to one embodiment of the present invention includes: bonding a plurality of positioning members to a back face side of a thin board-shaped decorative material; placing the decorative material in a mold such that the plurality of positioning members are inserted into positioning holes provided on the mold; and injecting a resin composition into the mold.

Abstract: A steering wheel is manufactured by making a steering wheel core member by forming a first resin layer about a metal core bar, and then attaching outer parts to the outside of this core member.

Abstract: An introduced-air-flow-rate SA is determined by adding an adjusted value A given from an oxygen density controlling system to a required-air-reference-flow-rate RA demanded by the charging amount of pellets The introduced-air-flow-rate is controlled where the required-air-reference-flow-rate RA is the feed forward value Thus, it the charging amount of the pellet is varied, since the introduced-air-flow-rate SA is determined by the adjusted value A and the required-air-reference-flow-rate RA varied in response thereto, the control response can be quickened without decrease of the stability.