Recently it is important to reduce the car weight for fuel consumption improvement. One of the solutions is to exchange materials from steel to light weight materials. In this case, the bolted joints with dissimilar materials sometimes are needed. When temperature change occurs on the bolted joints, expansions of two clamped parts are different due to different coefficient of linear thermal expansion. And that causes the sliding force on the contact surface between two clamped parts. In this study, the deformations and the stress distributions under temperature change are analyzed by FEM for the bolted joints that consist of the rectangular aluminum plate, the steel plate and two bolts. Finally, comparisons in the sliding force between the simplified calculations by the spring models and FEM analyses are conducted for several dimensions of the plates.