In this book the author has brought together his long-standing interests in theory of scientific rationality and hermeneutic ontology by developing a hermeneutic alternative to analytic (and naturalist) epistemology of science. The hermeneutic philosophy of science is less the name of a new field of philosophical than a demand for a repetition of the basic philosophical questions of science from hermeneutic point of view. The book addresses chiefly two subjects: (I) The hermeneutic response to the models of rational reconstruction of scientific knowledge; (II) The specificity of hermeneutico-ontological approach to the cognitive pluralism in science.