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Self-concepts of very young children are consitently high but with increasing life experience, when children learn their relative stregths and weaknesses, level of self-confidence declines and multiple dimensions of self-concept become more differentiated. The aim of the research is analysis of the relationship between the level of gross motor skills and children's popularity in school class. The research group consisted of 110 pupils (46 boys and 64 girls) in middle school age (9-11 years). The data was measured by Piers-Harris questionnaire (Piers and Herzberg, 2009) and the level of motor skills was monitored by TGMD-2 test (Ulrich. 2000) within the project IGA_PdF_2017_002. Based on the research results we can say that the level of gross motor skills contributes on child's adaptation in the group of school classes. Therefore it is necessary to examine this area further, support physical activity of children in young school age and intentionally develop children's motor skills.