To provide a structure in which dust is prevented from entering the inside of a room while a vehicle is traveled or when a station is arranged.

In the structure of a vehicle connecting part 4 to be used in an emergency medical station, which is constituted by connecting the rear end part or the side part of the vehicle 2, or the like, mounting a treatment room vehicle, an operation room vehicle and medical machinery implements, the connecting part is provided with a vertically movable shutter 6 which has a storing part on the upper part of the connecting part to enclose the outer periphery of the connecting part, a bellows shape hood 5 which is the inner periphery of the shutter and is extended/contracted in the vehicle front and rear direction, a partition 9 provided with a door 8 for shutting off a vehicle inner part from the outer air and for keeping the inside of the vehicle clean at the inner side of the shutter and a footboard 10 for a passage, which is attached to the lower part of the vehicle connecting part.