A guide rail for a window regulator which is light in weight and is high in rigidity, being formed from a hoop plate and having a double-bending portion which is raised at almost right angle with the hoop plate and in the longitudinal direction of the hoop plate. Furthermore, a slide-guide mechanism for a window regulator which is light and in which play is small when it is slidably moved, comprising the guide rail and a bracket which is slidably guided along the guide rail. The bracket has slide shoes arranged zigzag along the double-bending portion of the guide rail and provided with an oil groove on a side face coming into contact with the double-bending portion, and a guide shoe having a face to guide both side edges of the guide rail secondarily and a fitting member for securing a wire.