Abstract
Our interest, in this paper, concern the sorts of justice founded in the Republic of Plato. Therefore, I will take the reflections of Sachs and Vlastos about this topic. We assert, to the contrary of these searchers, that exist five principal forms in this work, namely: the justice in the elements of the soul; in the private relationships, governed by morality's standart precepts; in the public relationships, group that practise the maxim of doing its own in the polis; in the elements of the polis; and at last, that Plato don't discussed, but he have maked mention of, the relationship between a city and another. I conclude that these forms not depend on one another.