A device for fixing on the skin a catheter exiting a cutaneous emergency site has a flexible pad with an adhesive underside, a side slot starting from the edge of the pad and terminating in a hole which runs through the pad, the slot being sufficiently large for the pad to be laterally slid through the slot onto the catheter exiting the site until the hole is located on the site. The hole is located at the base of a housing in the upper surface of the pad. The pad has a foldable side tab including a cap adapted to be elastically wedged in the housing above the catheter when the tab is folded on the pad.