Effects of the configuration of a finned tube on the heat transfer characteristics of latent heat storage have been studied experimentally and theoretically. As a result, it has been shown that the performance of the latent heat storage unit is almost the same for finned tubes having the same surface area even if the fin configuration is different. Calculated results of heat fluxes for two types of finned tube have been in good agreement with the experimental values, and the validity of the calculations has been indicated.