An assembly for a vehicle seat that includes: a padding element, a support element, and a connector attached to the support element, with the support element assembled on the padding element. The assembly has an assembly member extending from a surface of the padding element, or formed by at least a portion of the support element, with the connector and the padding element each defining a first contact surface and a second contact surface, respectively, in contact with the first contact surface. The first contact surface and the second contact surface are substantially complementary, with the support element being assembled on the padding element by means of the assembly member, in an assembly direction.