The aim of this bachelor thesis was to examine the intergenerational transmission of loneliness assuming a relationship between parental and children‘s loneliness. Another part of the thesis was an exploration of other factors related to parental support of socialization that can affect this relationship. The target popula-tion were preschool children and their parents. The research involved 48 parent-child dyads. Both children’s and parental loneliness was assessed by self-report methods, for the assessment of children’s loneliness the Child Puppet Interview was used, while parental loneliness was measured by the UCLA loneliness scale. As a part of parental questionnaire, there were questions about parental support of socialization. Although the results bring the evidence of medium strength relation between parental loneliness and family-related loneliness in children, the intergenerational transmission hypothesis wasn’t supported by significant results. By conducting regression analysis, a model explaining 18 % of variance of family-related loneliness of children was found, while the only significant predictor was child’s attendance of afterschool activities. Limitations and future research recommendations are discussed.