This paper treats component based approach for the development of body action 3D games. The research group of the author has already proposed a 3D software development system called IntelligentBox. IntelligentBox has provided various software components called boxes, which are 3D visible, reactive objects. IntelligentBox allows the user to develop 3D graphics applications including 3D games by combining already existing boxes through direct manipulations on a computer screen. This is the main feature of IntelligentBox, which is a difference from other conventional systems. In this paper, the author introduces the extension of IntelligentBox to the development of body action 3D games. To deal with body actions, various components, i.e., particular boxes, those handle input devices frequently used in virtual reality applications, are introduced to IntelligentBox. Furthermore, the author introduced a particular component called virtual mouse pointer to make it possible to manipulate 3D objects using an input device like a data-glove.