Disk brake has been used generally as braking system at present. The kinetic energy of car is transformed into the thermal energy in a short time by disk brake and the car is to reduce the speed or stop. But it is indispensible to have the strong durability because the disk brake is operated at the considerably severe environment under the high temperature and pressure. In this study, three kinds of disk brakes according to the fixed and floating caliper types being on sale in the open market are modelled. The structural and thermal analyses are carried out with the finite element analysis program of ANSYS. The analysis results are also synthesized and compared. When only a simple braking force is applied to disk brake, the quantities happened as the corresponding maximum deformation and stress do not become large. But the maximum deformation and stress are confirmed to be quite increasing when considering the conditions of temperature and thermal convection due to braking force and fractional heat altogether. As the durability through the simulation analysis of each disk brake is studied on the background of this study result, it is thought to be contributed to more safe design of disk brake.