Keiichi Yamada’s first and recent book, The Last Thinking of Wittgenstein: An Encounter between Certainty and Contingency, aims at bringing out it into relief Wittgenstein’s philosophy of knowledge that is embodied especially in his “last” thinking, which the author extracts mainly from On Certainty, and locating it in the context of contemporary discussions on knowledge. This book should be interesting very much not only to Wittgenstein scholars but also to those who are engaged in philosophy in general. I shall make several and somewhat critical comments.