Jean-Jacques Rousseau’s Émile is preserved in three original editions of two affiliations: the Paris editions published in octavo and in duodecimo by Nicolas-Bonaventure Duchesne （1712-65）and the Amsterdam edition published in octavo by Jean Néaulme（1697-1780） in 1762. That same year, Duschesne published second and third editions in two formats. In addition, we have many pirate editions and we now distinguish in total 19 editions of 14 affiliations of Émile with publication date 1762. In this article in Japanese we will present precise points to distinguish the original editions from the others, according to the studies executed by the Western Rousseauists, published in French and in English. Although we do not present any new discoveries, this is a worthwhile pursuit given that Japanese Rousseauists have never discussed this subject so far.