To provide a miniaturized radiator ventilation structure reducing costs without increasing the number of parts.

In this radiator ventilation structure, an opening/closing means is provided to an outside air introduction part capable of introducing traveling wind to a vehicle body front part from an opening at a vehicle body front end, and the opening/closing means is opened/closed by a torque motor 26 controlled by a control part 27, so as to control an amount of the traveling wind fed to the radiator provided at the vehicle body front part. At least a part of a stator core 65 of the torque motor 26 is formed of a metallic member (silicon steel plate), and the control part 27 made of a control substrate is in contact with the metallic member.