An air cooling structure for a vehicle (10, 90) mounted object applied to a vehicle having a removable roof portion, the roof portion covering a vehicle compartment space from above, and the vehicle having a mounted object installation space formed in an interior of the vehicle and located at the rear of the vehicle compartment space, wherein the mounted object installation space is arranged to receive a vehicle mounted object; the air cooling structure comprising: an air suction part having an opening at one end disposed behind a seat disposed along the rear end of the vehicle compartment space and having the other end connected to the mounted object installation space, such that air flows from the one end to the other end through the air suction part; and an air flow introducing unit disposed in front of the opening of one end of the air suction part and directing an air flow, which has passed above the vehicle compartment space and is flowed forward in the front and rear direction and downward in the upper and lower direction of the vehicle, to the one end of the air suction part; and the air suction part is inclined such that the other end of the air suction part is located in front of and below the one end of the air suction part, the air suction part comprises an inclined surface arranged to receive foreign matter from the one end of the air suction part; and characterised in that the air cooling structure further comprises a foreign matter trapping channel, the foreign matter trapping channel being a trap drain and having a top end portion thereof open between the one end and the other end of the air suction part, such that foreign matter sliding down along the inclined surface of the air suction part drops into the foreign matter trapping channel, wherein the top end portion of the foreign matter trapping channel is provided at the inclined surface of the air suction part and substantially at a position where the top end portion of the foreign matter trapping channel does not overlap a one end portion of the air suction part in the upper and lower direction of the vehicle (10,90). the air cooling structure comprising: an air suction part having an opening at one end disposed behind a seat disposed along the rear end of the vehicle compartment space and having the other end connected to the mounted object installation space, such that air flows from the one end to the other end through the air suction part; and an air flow introducing unit disposed in front of the opening of one end of the air suction part and directing an air flow, which has passed above the vehicle compartment space and is flowed forward in the front and rear direction and downward in the upper and lower direction of the vehicle, to the one end of the air suction part; and an air suction part having an opening at one end disposed behind a seat disposed along the rear end of the vehicle compartment space and having the other end connected to the mounted object installation space, such that air flows from the one end to the other end through the air suction part; and an air flow introducing unit disposed in front of the opening of one end of the air suction part and directing an air flow, which has passed above the vehicle compartment space and is flowed forward in the front and rear direction and downward in the upper and lower direction of the vehicle, to the one end of the air suction part; and the air suction part is inclined such that the other end of the air suction part is located in front of and below the one end of the air suction part, the air suction part comprises an inclined surface arranged to receive foreign matter from the one end of the air suction part; and characterised in that the air cooling structure further comprises a foreign matter trapping channel, the foreign matter trapping channel being a trap drain and having a top end portion thereof open between the one end and the other end of the air suction part, such that foreign matter sliding down along the inclined surface of the air suction part drops into the foreign matter trapping channel, wherein the top end portion of the foreign matter trapping channel is provided at the inclined surface of the air suction part and substantially at a position where the top end portion of the foreign matter trapping channel does not overlap a one end portion of the air suction part in the upper and lower direction of the vehicle (10,90).