Autism spectrum disorder is neurological and developmental disorder, which is characterised with deviation in the field of communication and social interaction, together with stereotypical behaviour and limited interests. Specific cause of this disorder is still unknown, but it is first noticed in early childhood and lasts throughout whole lifespan. It is proved that early diagnostic and intervention lead to better developmental outcomes in children with autism spectrum disorder. Number of children with this disorder, which enrol in facilities for early and preschool upbringing and education, is increasing. Preschool teachers are the ones that, together with parents, take care of children and their mutual collaboration is extremely important. Purpose of this paper is to investigate elements of collaboration between preschool teachers and parents of children with autism spectrum disorder, together with emphasizing importance of their collaboration. In order to do this investigation we interviewed parents and preschool teachers of three different children with autism spectrum disorder. As well as children with this disorder require help, so do preschool teachers and parents. Parents require advising and support, but it is also important that they collaborate with preschool teachers, because they know their child the best and can provide information about child and his needs.