This thesis is concerned with the illustration for children and its visual perception of the younger school age children in terms of Leisure time education. There are two parts in my thesis, a practical part and a theoretical part. The theoretical part describes the Younger School Age from a view of the Behavioural Psychology and also of the factor participating in an Education and Leisure time education of children. The thesis also includes the illustration, introduced as a part of Art, its historical evolution and an evolution of the Czech Illustration for children. There is also mentioned a personality of the illustrator and his creative language in this part, and moreover there is an introduction of popular illustrators of the 20th century and their production for children. The practical part is focusing on a realization of the project. It is divided in two main parts. The first part is formed by activities related to the Literature and Illustrations for children, being a base for the qualitative research. The second part is devoted to the children perception of single areas relating to the Illustration and its processing by the interviews made with children.