Artificial biped walking has been invented since epoch of Greek mythology. There are a lot of reasons why human tries to invent a biped walker. For example, they want to have artificial labor or comprehend the mechanism of biped walking by synthesizing the artificial biped walker, etc. However the reason might come from a primitive motivation that they just want to make something which achieves what they can always do but what only they do, that is, biped walking. On the other hand, population of young Japanese people who are interested in science tends to decrease recently, and then lots of science (including robotics) education programs has been proposed in order to motivate them. The biped walking is one of attractive topics not only for academia but also for the science education even if it is for primary school children. The purpose of the paper is, hence, to propose a design strategy of three dimensional passive dynamic walker made of cardboard for science and robot education. In order to introduce the walker as a educational program, a precise design method of the walker is provided and is validated through some experiments. Moreover, the program is validated through some class for primary school children and university students.
