Disclosed herein is a device for removably coupling a disposable nozzle tip for a bidet. The device includes a nozzle, a nozzle tip, a guide cover, and a removable coupling unit. The nozzle has a nozzle body through which a washing-water guide hole passes, and a coupling hole. The nozzle tip has a coupling protrusion removably inserted into the coupling hole, and a jet hole to spray washing water. The guide cover is secured to a bottom of the nozzle tip in such a way as to be positioned under the jet hole, and guides the washing water to the jet hole. The removable coupling unit includes external threads formed in an outer circumference of the coupling protrusion, and internal threads formed in an inner circumference of the coupling hole. Further, the device includes stoppers comprising a pair of a protrusion and a hole, or a pair of protrusions, provided on the nozzle and the nozzle tip in such a way as to be symmetric with respect to each other, and preventing the nozzle tip from excessively rotating relative to the nozzle. The device provides a clean nozzle tip, thus allowing the genital and anal areas to be hygienically washed using washing water, and simplifies the structure of the nozzle tip, thus facilitating a mounting and detaching operation, and includes stoppers, thus preventing the nozzle and the nozzle tip from being damaged.