To trace paths to knowledge or to follow the journey searching for knowledge is to some extent equivalent to reading a philosophical book. Plato, who perceives this relation between journey and philosophy, writes his dialogues as if each of his works were a journey to knowledge. This paper inquires into the ascent and descent motif that is the symbolic motion of a philosophical journey and appears in Plato’s Politeia repeatedly. By means ofthis motif, Plato depicts the journey of the soul in several different ways. This examination will show a possible way to read Plato’s dialogue as a philosophical journey. This journey is undertaken by Plato or the figure Socrates, but at the same time it involves its readers in philosophical inquiries.