The diploma thesis deals with the analysis of the thematic-ideological layer in Josip Pupačić's early poetic works, i.e. his collections Rains sing on poplars (1955.) and Young men (1955.). The first part is theoretical, and deals with the description of Pupačić's biography, the basic features of the Krugovi generation, and the description of Pupačić's early poetry. In order to get the best possible insight into the thematic and ideological layer, the basic motifs of Pupačić's early poems, those that were not published in the mentioned collections (eg Student town I, II, The storms are coming, Apocalypse...) are presented. The theoretical part is followed by the interpretation part. The paper presents the fundamental characteristics of Pupačić's collections Rains sing on poplars (1955.) and Young men (1955.), and tables of motifs and their functions are presented in order to better discern the dominant motifs. The interpretative emphasis is placed on the thematic layer, which is accompanied by an analysis of stylistic figures, and some of the analyzed songs stand out: Cetina, In love with love, My tree brothers, Sea and many others. At the end of the paper, the main conclusions based on the conducted analysis were presented.