The present invention provides a roller connector rotatably retaining a plurality of rollers arranged in a line and capable of being incorporated into an endless roller-circulation path of an endless sliding type linear guide unit and it also provides an improved linear guide unit using such roller connector. The roller connector comprises a plurality of rollers arranged in a row with the axes of rotation of the rollers being held parallel with one another, a plurality of spacers interposed between a plurality of rollers and each provided with a pair of concave seats with which each of the rollers comes into sliding contact and an elongate flexible connecting portion adapted to connect the spacers together and characterized in that the connecting portion is connected to the spacers at a position at which the outer peripheral surface of each of the rollers is divided into two substantially equal parts in the axial direction and that the connecting portion is provided only one side of the line of rollers.