Abstract
The Authors have been teaching scientific principles and technical matters to children who belong to "Gamagori Invention Club for Boys and Girls" for about 5 years. We especially want to use teaching instruments which are made by ourselves and materials which can be easily gotten by children in our classes. The report indicates an example of our classes carried out in 2010. The main contents refer to hydrodynamics and related things. Most of children merrily took part in the classes. It seems that they like to make various things and try them experimentally. On the contrary, they do not like to listen to explanations. These experiences taught us various items on technological education to children or pupils. Firstly it is important to select subjects in which children are interested. Secondly it is important to get sufficiently ready for classes. It became clear that handcraft classes or experimental ones attracted a lot of children. We hope that our actions will be useful for technological education to children.
