This paper concerns a transient thermal stress analysis of a laminated beam made of different materials in multilayers. To simplify the problem, we treat the heat conduction problem as a one-dimensional case in the direction of thickness; then we evaluate the transient temperature solution using the Laplace transform method. For the thermoelastic fields, we obtain the thermal stress distributions by using the elementary beam theory and Airy's thermal stress function method. As an example, we carry out numerical calculations for a laminated beam made of five layers and then examine the numerical results.