Provided is a track member (1) of a rolling guide device with which temperature control for cooling or heating can be performed efficiently using heat pipes (7), and in which it is possible to reliably perform the temperature control even with as many as m number of long heat pipes. The track member (1) is configured such that a plurality of heat pipes (7) are built therein, the heat pipes (7) are arranged in at least two rows along the longitudinal direction of the track member (1), both ends of one heat pipe (7) in either row overlap two different heat pipes (7) in the other row with respect to the width direction of the track member (1), one end of the heat pipe (7) positioned at the longitudinal end of the track member (1) protrudes from the track member (1), and a cooling device or a heating device is connected to this protruding end.