To provide a slide rail capable of obtaining a smooth slide state.

Concerning a slide rail 100 composed of an outer member 1, an intermediate member 2 and an inner member 3, the outer member 1 has a substrate 10, upper and lower ball regulating projection 11 and 1, upper and lower edges 12 and 12 and upper and lower forward protruding edges 13 and 13 and the intermediate member 2 is composed of a substrate 20 and upper and lower edges 21 and 21 provided successively to the upper and lower terminal parts of the substrate 20. In this case, balls 40... held by outside ball retainers 4 and 4, which are formed at the upper and lower edges 21 and 21 of the intermediate member 2, so as to be freely rotated are held by recessed holding grooves 22 and 22, upper and lower ball regulating projections 11 and 11 and the upper and lower edges 12 and 12 of the outer member 1 so as to be freely rotated.