Thermoacoustic phenomenon is interconversion between the acoustic energy and the thermal energy. Thermoacoustic devices are external-combustion system and have a flexibility for choosing a heat source. They consist of a prime mover for generating sound and a heat pump for sound to compress and relax the gas within it. To generate sound waves at the prime mover, a certain temperature difference across the stack is needed. The conventional methods for heating a hot-end of stack are by placing heat exchanger at the side of stack. There are inefficiencies such as friction and heat losses at heat exchanger. In this study, to minimize friction and heat losses, radiation heat transfer is focused as the optimum heating method for the thermoacoustic prime mover. The thermoacoustic prime mover using a quartz glass tube was developed. The sunlight collected by the parabolic reflector was directly focused on the hot-end of stack. Considering the balance between sunlight to heat conversion and flow resistance, various stacks that are different from materials and channel shapes were evaluated with temperature difference and the pressure of the generated acoustic wave. For the radiation heating, the stack with low flow resistance and high specific surface area is suitable for sunlight.