To provide a radiator front duct structure capable of reducing the required opening area of an air guide member without reducing the inflow air volume.

In the radiator front duct structure, a front grille member 4 is arranged in front of a radiator 1, and a pair of air guide members 7 are provided between an opening part 5 formed in the front grille member 4 and a side part of the radiator 1. The pair of air guide members 7 are arranged in a spreading shape opened backward of a vehicle.