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The Kulon Progo Mountains, which are on the southern side of Java Island, have the dominant influence of N-S compressional stress, the result of the subduction of the Indian Ocean plate at southern of. To the east of the Kulon Progo Mountains, there is Yogyakarta area, which has tectonic interaction with the Southern Mountain of Java. This tectonic interaction has an influence on the geological structure of Kulon Progo Mountains. This research was conducted by mapping and analyzing the geological structure found in the Kulon Progo Mountains. Analysis of the geological structure using stereographic method was carried out on the structure of faults which were found in the field so that the stress direction forming them was obtained. Kulon Progo Mountains have compressional stress from the East (E) to Southeast (SE) direction or from Yogyakarta and the Southern Mountain of Java. The East to Southeast compressional directions gives effect to the Kulon Progo Mountains in addition to the main compressions of the N-S direction.