Introduction: Autism spectrum disorder is a developmental and complex disorder which is neurobiologically conditioned and affects all aspects of social development. Difficulties are mostly reflected as communication and social impairments, and as limited interests and repetitive behaviour patterns. Even when individuals with autism spectrum disorder are very talented, the aforementioned deficiencies can complicate the process of school completion and recruiting and maintaining an employment. Additionally, insufficient knowledge of social norms and sensory issues could cause difficulties in the integration process of everyday activities. Purpose: The purpose of this diploma thesis is to establish the information on how adolescents with autism spectrum disorder perceive the transition to adulthood. Methods: We used a qualitative research methodology in this diploma thesis. Data was obtained through a semi-structured interview. In order to carry out the research work, we collaborated with one of the autism spectrum disorder societies. 5 adolescents between the age of 15 and 24 participated. The interview transcripts were analysed by using the qualitative analysis method. Results: After a carryout of the qualitative data analysis, we formed seven themes that mark the period of adolescents’ development with autism spectrum disorder: (1) the diagnosis impact on an adolescent, (2) education, (3) social relationships, (4) activities integration, (5) obstacles in the social participation, (6) excessive response to the sensory stimulation and (7) future goals. Discussion and conclusion: Autism spectrum disorder is reflected differently on each individual. Participants highlighted difficulties in communication, social interaction, environment and sensory integration. Education years induced difficult time for most of the participants, furthermore, difficulties were often caused by participants’ schoolmates with their taunts. According to the participants, people are still poorly aware about autism which hinders the integration of people with autism spectrum disorder and presents obstacles of an employment search which is commonly highlighted participants’ desire. Occupational therapists can significantly contribute to the social integration of people with autism spectrum disorder in all age groups.