A disinfecting/sterilising machine (1 ) for disinfecting/sterilising endoscopes, comprising: a tunnel (4) having a first opening (5) and a second opening (6) an upper wall (7) which delimits the tunnel (4) a first lateral wall (1 1) positionable at the first opening (5) such as to obstruct the tunnel (4) a second lateral wall (12) positionable at the second opening (6) such as to obstruct the tunnel (4) a bath (9) for receiving an endoscope to be disinfected/sterilised a bath support (9) guide means (8) for guiding the group comprising the bath support (10) and the bath (9) along the tunnel (4) between a first endrun (A1 ) in which the bath (9) projects externally from the first opening (5) of the tunnel (4) such as to be accessible for inserting or extracting the endoscope and a second endrun (A2) in which the bath (9) projects externally from the second opening (6) of the tunnel (4) such as to be accessible such as to Insert or extract endoscope. The upper wall (7) forms, with the bath (9), a closed chamber (13) such as to disinfect/sterilise the at least an endoscope when the bath (9) is internal of the tunnel (4) the first lateral wall (11 ), when at the first opening (5), is couplable alternatively and removably: with the frame (2), such as to be solidly constrained to the frame (2) and obstruct the tunnel (4) or with the bath support (10) such as to be solidly constrained to and be drawn by the group and enable the group to reach the first endrun (A1 ) the second lateral wall (12), when at the second opening (6), is alternatively and removably couplable with the frame (2), such as to be solidly constrained to the frame (2) and obstruct the tunnel (4) or with the bath support (10) such as to be solidly constrained to and be drawn by the group and enable the group to reach the second endrun (A2).La présente invention concerne une machine de désinfection/stérilisation (1) permettant de désinfecter/stériliser des endoscopes, comprenant : un tunnel (4) possédant un