Abstract

I have first translated Sein und Zeit in Japanese in 1971 in collaboration with my elder colleague Prof. Hara in Tokyo. But in 1976 both he and Martin Heidegger died, and in 1977 a new edition of Sein und Zeit was published as part of Heidegger’s complete works. This new edition included many marginal notes of Heidegger’s and many textual revisions made by Heidegger himself. Therefore, I have published in 2003, based on the old version of my Japanese translation, a totally revised Japanese translation of Sein und Zeit, in which, as translator, I have written a new introduction, many explicatory notes about Heidegger’s marginal notes and textual modifications and a chronological detailed record of Heidegger’s career. Out of this experience, I would like to detail upon two aspects: first, any nowadays reader of this work must study not only the original text itself, but also, by all means, Heidegger’s marginal notes, in order to correctly grasp a development of his thought on Being. Secondary, a reader must especially pay attention to the difficult problem of the relationship between authenticity and inauthenticity of the Being-in-the-world, because here is the most basic problem of the existence of Dasein and it is here the place where the turning point in Heidegger’s later thought on Being has its origin.