This article intends to describe the central themes of Millán-Puelles' thought. The fundamental intuitions of his youth remain over the course of his life and mark a line of creative and personal thinking between Phenomenology and classical philosophy, mainly Thomism. He elaborates a metaphysics of knowledge with a vigorous defence of spontaneous realism. His defence of the real leads him to grant special importance to the study of the unreal. Likewise, he is interested in practical problems, which in his view (...) are intimately linked with metaphysical ones. (shrink)