The invention relates to a device for attaching a wristlet strand to a watch case, the device being arranged to be attached to a bar, the wristlet strand being attached to the bar through attaching means. According to the invention, the attaching means are formed by a support integral with the wristlet strand, a pull-out piece arranged to cooperate with said support so as to close the support, the support comprising a channel capable of receiving the bar, and in that they comprise a pair of magnets disposed on the support and the pull-out piece so as to hold the pull-out piece against the support and allow the pull-out piece to switch from a closed position wherein the bar is held in the channel to an open position wherein the bar is free.