In order to create a sink attachment for arranging on a sink, comprising a coupling device for coupling the sink attachment to a coupling sidewall of a basin of the sink in a working position, which can be easily and stably positioned without multiple horizontal supporting faces having to be formed at the same height on the sink or on a work surface on which the sink is arranged, and without the functionality of the sink attachment or of the sink being limited, it is proposed that the coupling device comprises an inner coupling element that is configured to be seated, in the working position, onto the inner side of the coupling side wall facing the interior of the basin, and comprises an outer coupling element that is configured to be seated, in the working position, onto an outer side of the coupling side wall facing away from the interior of the basin.
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