The ostomy collecting system comprises a collecting bag (1) having an inlet opening (4) formed in a bag wall and with surrounding connecting elements (5) for connection with a stoma in a user, and a carrier device (2) for the collecting bag. The carrier device comprises a base plate (6) for fastening on the user and a substantially annular first flange (7) connected to the base plate via a first connecting section (8). The connecting elements comprise a substantially annular second flange (9), which is fixedly connected to the collecting bag via a substantially annular second connecting section (10) and is designed for removable and adhesive connection with said first flange. The first and the second flanges (7, 9) are connected with the base plate (6) and the collecting bag (1), respectively, in such a manner that the outer radius of said second connecting section (10) exceeds the outer radius of said first connecting section (8) by a value which at least equals the total thickness of the first and the second flanges (7, 9). The adhesive connection between the collecting bag and the carrier device is provided by a layer (11) of adhesive applied on said second flange (9) and capable of repeated adhesion with the first flange, and the first and the second flanges are made from a flexible and resilient material. Both the first and the second flanges (7, 9) are formed as discs of cellular plastic material. |