An air compression device , comprising: a compression mechanism (300A; 340) including a compressor, configured to compress air and generate compressed air; and a housing in which the compression mechanism (300A; 340) is housed, characterized in that the air compression device further comprises: a connecting structure configured to connect the housing to an underside of a floor of a vehicle (TCH), wherein the housing includes a top plate facing the underside of the floor, and wherein the connecting structure includes a vibration isolator which is in contact with the top plate and is configured to reduce vibration transmission from the compression mechanism (300A; 340) to the vehicle; a guide pipe having a base end connected with the compression mechanism (300A; 340) provided in the housing and a distal end exposing outside of the housing for guiding compressed air to an outside of the housing ; and a cooling device configured to cool the compressed air, the cooling device being held by the housing outside the housing , and the cooling device including a cooling pipe having an upstream end connected with the distal end of the guide pipe for flowing the compressed air, a protective frame for protecting the cooling pipe , and a fan device for blowing out air toward the cooling pipe . a compression mechanism (300A; 340) including a compressor, configured to compress air and generate compressed air; and a housing in which the compression mechanism (300A; 340) is housed, characterized in that the air compression device further comprises: a connecting structure configured to connect the housing to an underside of a floor of a vehicle (TCH), wherein the housing includes a top plate facing the underside of the floor, and wherein the connecting structure includes a vibration isolator which is in contact with the top plate and is configured to reduce vibration transmission from the compression mechanism (300A; 340) to the vehicle; a guide pipe having a base end connected with the compression mechanism (300A; 340) provided in the housing and a distal end exposing outside of the housing for guiding compressed air to an outside of the housing ; and a cooling device configured to cool the compressed air, the cooling device being held by the housing outside the housing , and the cooling device including a cooling pipe having an upstream end connected with the distal end of the guide pipe for flowing the compressed air, a protective frame for protecting the cooling pipe , and a fan device for blowing out air toward the cooling pipe . a connecting structure configured to connect the housing to an underside of a floor of a vehicle (TCH), wherein the housing includes a top plate facing the underside of the floor, and wherein the connecting structure includes a vibration isolator which is in contact with the top plate and is configured to reduce vibration transmission from the compression mechanism (300A; 340) to the vehicle; a guide pipe having a base end connected with the compression mechanism (300A; 340) provided in the housing and a distal end exposing outside of the housing for guiding compressed air to an outside of the housing ; and a cooling device configured to cool the compressed air, the cooling device being held by the housing outside the housing , and the cooling device including a cooling pipe having an upstream end connected with the distal end of the guide pipe for flowing the compressed air, a protective frame for protecting the cooling pipe , and a fan device for blowing out air toward the cooling pipe . <EOS>