To provide a cooling wind intake part structure to a vehicle-mounted heat generating component that can maintain a required cooling efficiency without increasing a fan wind amount by preventing air leak of a duct.

An air intake port 31 of a duct 30 on the air intake side to be connected with an electrical component box 20 is arranged between a seatback 10 in a standing position and a side panel. A striker extends out to a position at which it engages with a lock metal on the seatback 10 side, passing through the inside of the duct 30 on the air intake side. In both sidewalls of the duct 30 opposing to each other, a pair of through-holes through which the striker penetrates are formed rearward of the air intake port 31. To the through-hole, a seal member for blocking from the inside of the duct 30 a flow of cooling wind through a gap between the through-hole and the striker is attached.