The Japan Society of Calorimetry and Thermal Analysis (JSCTA) celebrates this year the 50th anniversary of the Japanese Conference on Calorimetry and Thermal Analysis (JCCTA). The first annual conference was organized in 1965 by the late Prof. Syûzô Seki. In those days, important conferences and associations were established such as “International Conference on Chemical Thermodynamics (ICCT)” by IUPAC, “Calorimetry Conference (CALCON)” in North America, “All Union Conference on Calorimetry” in Soviet Union, “Experimental Thermodynamics Conference” in UK, the first conference of the “International Confederation for Thermal Analysis (ICTA)”, “North American Thermal Analysis Society (NATAS)”，”Association Française de Calorimétrie et Analyse Thermique (AFCAT)”, “Gesellschaft für Thermische Analyse, e.V. (GEFTA)” in Germany, and so on. One of the characteristic aspects of JSCTA is excellent collaborations between calorimetry and thermal analysis. It is admirable that today's prosperities of the society and the conference have been accomplished by every endeavor of all the members since the foundation of the society. As the period of fifty years is actually very long, a lot of members don’t know how this society was founded and what history both the society and the conference have had. Their histories are described chronologically. I hope that this retrospection will contribute to the future development of the society.