To provide a structure of dividing lines with which clearness can be permanently held and a smooth track is displayed over the whole track and which has a hardness close to the ground and with which there exists no possibility of stopping flow of rain water.
A dividing line member 4 which has a base member 5 of which on both side parts of which hooking parts 8 are formed and a cover member 6 covering the top part of the base member 5 and having hooking pieces 10 hooking on the hooking parts 8 of the base member 5 and consisting of an elastic material and projects a number of projections 11 whose top faces are at least appropriately colored at some intervals 12 on the top face of the cover member 6 is buried in the ground in such a way that the top faces of the projections 11 coincide with the surface of the ground.