The invention relates to an assembly (100) forming a cap for a cosmetic product container, said assembly having a longitudinal axis (XX ') along which extend a first element (110) intended to be mounted on the container and a second element (120) detachably assembled around the first element (110), characterized in that the first element (110) has elastically radially deformable tabs (115) for the assembly / disassembly of the second element (120) on the first element (110), said tabs (115) cooperating, in the assembled position, with notches (126) formed inside the second element (110), and said assembly (100) also comprises a complementary disconnecting means (130) movable between a first extreme position in which the legs (115) of the first element (110) are in engagement with the notches (126) of the second element (120) for the assembly of the first and second elements, and a second extreme position e wherein said tabs (115) disengage radially from said notches (126) for the disassembly of the first and second elements. Figure for the abstract: Fig. 1
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