The coding education given within the scope of STEM (Science, Technology, Engineering, and Mathematics) education gives children computational thinking skills. Computational thinking involves a set of problem-solving, algorithmically thinking, analytical thinking and critical thinking skills. When the coding education is given to children by an ER (Educational Robotics), the content of the education becomes more tangible and fun. In addition, ER helps develop motor skills and hand-eye coordination. It supports children's social development by directing them to collaboration and teamwork. In this study, an educational coding robot with magnetic board that makes the coding education suitable for preschool children was designed. This platform has attractive visual design, audible and illuminated warnings. In addition, it is computer-independent, easily portable and can be operated wirelessly. The educational robot was introduced for use by 40 children aged 4-5 years old. The interaction of the children with the robot was observed by 10 people in total, consisting of pre-school teachers and academicians. An evaluation form containing open-ended questions has been created to evaluate whether the prepared educational robot is a useful material for teaching pre-school children. Answers and suggestions from users were recorded and interpreted according to content analysis. It was determined that the educational coding robot with magnetic platform developed according to the obtained data is suitable for the pedagogical properties of the target group. In addition, it is concluded that there is an educational material that can be used for the expected purpose.