fresco
Good question. And the answer is: yes, he does. You see, this book reproduces the University class of 1935. So, in the second part of the book, Heidegger studies carefully Kant's first Critic, in a very academic way.
I choosed this question because it seemed interersting, not because of the book itself.
But in more original works, like "Sein un Zeit", from 1928, the question put by Heidegger is a little different: the question of the being (Sein), that he sees in our presence in the world and interaction with it.