This is a study to confirm the contact pressure distribution upon changes in horizontal force through finite element analysis of a flexible padder. When there is no horizontal force, the value of contact pressure in the center of the roller is greater than the value of contact pressure at the end of the roller. The results of this study showed that the flexible padder has the optimum value of horizontal force with uniform contact pressure distribution. Measuring the contact pressure in an actual flexible padder drive by using a prescale film, this study proved that the interpretation of finite element analysis reflects reality well. Importantly, the results of this study can be used for deciding the early settings of flexible padder horizontal force.