The cab comprises a driving compartment body and a vehicle door, the driving compartment body comprises a front portion and side portions located on the two sides of the front portion, wheel openings are formed in the side portions and used for being matched with front wheels, the wheel openings and the front wheels are concentrically arranged, the vehicle door is connected to the side portions and can be opened relative to the side portions, and the vehicle door comprises a
front edge and a rear edge which are arranged in the X direction; in the X direction, the
front edge and the rear edge of the vehicle door are located on the two sides of the center point of the wheel opening respectively, in the X direction, the distance between the rear edge and the center point of the wheel opening is L1, the distance between the
front edge and the rear edge is L2, and the ratio a of L1 to L2 is larger than or equal to 0.65 and smaller than or equal to 0.95. According to the cab, the man-
machine design of the cab can be optimized, the driving comfort and getting-on and getting-off convenience of a driver are improved, furthermore, the driving length requirement and / or the cab wind resistance design requirement can be considered while the man-
machine design of the cab is optimized, and the streamline cab with low wind resistance is formed.