Spindle drive of an adjustment device of a motor vehicle seat

A spindle drive of an adjustment device of a motor vehicle seat, comprising an electric motor, a spindle and a nut unit, the electric motor configured to drive the spindle, the nut unit comprising a nut made from plastic and a retainer, the nut having an internal thread which is in engagement with the spindle, and the nut is retained in the retainer, wherein the nut has an outer jacket, the outer jacket has recesses, the retainer is configured as a tube section, the tube section has an inner space generally adapted to the outer jacket, the tube section, in the area of the recesses, is deformed towards an inside such that material of the tube section is located within the recesses, the tube section and the nut are substantially coaxial, the outer jacket is delimited by a cylinder tube section, the recesses define at least one peripheral furrow, and the retainer, in areas in which at least some of the recesses of the nut are located, has annular deformations reaching into said at least some of the recesses, so that a portion of material of the tube section of the retainer is located in said at least some of the recesses.