To provide a relatively inexpensive running course board structural body which is suitable for mass production with a simple structure by enabling the building up of two types of running course boards with one running board structural body to allow small children to enjoy elaborately with a highly economical advantage while simplifying the manufacturing of a self-travelling body on a track and the altering of the course of the self-travelling body.

In a running course board structural body A for composing an intersection part of a running course board, which is linked freely separably through a link part 3 to be built up according to a desired layout, rocking bars 10 and 20 for switching direction are mounted free to oscillate separately on the surface side and on the rear side of a substrate 1. On the surface side of the substrate 1, a self travelling body on a track for an electric car toy or the like is arranged to run and a track part 5 is formed and on the rear side of the substrate 1, right and left side walls 2 are formed to make a self- travelling body such as car toy run thereon.