Radiator core support structure for vehicle

A radiator core support structure for a vehicle including a radiator core support upper section extending generally along a direction of width of the vehicle. A radiator core support lower section is provided extending generally along the direction of width of the vehicle and located below the radiator core support upper section. Here, the radiator core support upper section and/or lower section are formed of metal and has an open loop-shaped cross-section which is opened rearward to form a channel. A hood lock stay is provided extending generally vertical, to connect the generally central parts of the radiator core support upper and lower sections. The hood lock stay is formed of synthetic resin and molded in a metallic mold in which the radiator core support upper section and/or lower section are located. A plurality of reinforcement ribs are formed of the synthetic resin and fixedly disposed inside the channel of the radiator core support upper section and/or lower section. The reinforcement ribs continuously extend in a longitudinal direction of the radiator core support upper section and/or lower section. Each reinforcement rib extends to fixedly connect an upper wall and a lower wall of the radiator core support upper section and/or lower section. Additionally, a struck portion is integrally formed at a part of each reinforcement rib and to be struck by an ejector pin for extracting the radiator core support structure from the metallic mold.