To provide a manufacturing method of a decorating gasket for a joint and manufacturing equipment thereof which can form a deep grain pattern simply without using a heating device, in particular.

This method has a constitution wherein a decorating gasket 10 for a joint which has seal lips 2 and 3 formed on the opposite sides of a leg part 1 having a virtually T-shaped section and to be fitted in the joint and has a decorative layer 5 provided on a surface head part 1A which constitutes a letter T and which is positioned on the rear end side and covers the opening part of the joint at the time of fitting-in is discharged from a head 30 of an extruding machine and, in this process, a grain pattern is formed on the decorative layer 5 by pressing a graining roller 20 thereon. In this case, the surface head part 1A provided with the decorative layer 5 is discharged from the head 30 of the extruding machine prior to a portion 1B of the leg part 1 other than that, while only the surface head part 1A with the decorative layer 5 discharged in advance is pressed by the graining roller 20 to be subjected to plastic machining, in a time before the other portion 1B of the leg part 1 is discharged.