This paper deals with a driving stability analysis method of a kart considering an elastic deformation of the kart frame. The stiffness matrix of the kart frame was calculated with the finite element method, and the vertical load of each tire simulation was analyzed with this stiffness matrix. In addition, the vertical load distribution was examined with tests to validate the stiffness matrix, and it was confirmed that the experimental results agree with simulation results. Furthermore, the driving stability was evaluated with simulations, and it was observed that the elastic deformation of the kart frame effects on the steering characteristic.