The utility model discloses a chassis for a vehicle. The chassis is applied to a wagon and comprises a sleeper beam, a first cross beam, a second cross beam, an end beam, a middle beam and bathtubs, wherein the middle beam is transversely fixed on the sleeper beam, the first cross beam and the second cross beam in sequence, and the end part of the middle beam is fixedly connected with the end beam to form the chassis; the bathtubs are fixed in the middle of the middle beam, and the tub opening of each bathtub is lower than the plate surface of a bottom plate of the wagon. A space below the floor surface of the vehicle is reasonably utilized, so that the tub opening of each bathtub is lower than the plate surface of the bottom plate of the wagon, and the internal volume of the vehicle is increased; meanwhile, the bathtubs are arranged at the bottom of a vehicle body, so that the gravity of the vehicle is lowered.