A device (1, 100) for separating a membrane (81, 91) to analyze from a support (83, 93), the membrane being mounted in a frame (82, 92), itself mounted on a support, having a body (10) comprising a longitudinal recess (11, 110, 120) for translational reception of the assembly constituted by the frame mounted on the support, the recess having a first end (12) and a second end (13) and longitudinal sides (14A, 14B, 111, 121) facing each other between said two ends, the device having bearing means (30, 112, 122) for a first member of the frame/support group between the first and the second end of the recess, which are adapted to serve as a bearing for the first member of the frame/support group once the assembly is disposed in the recess, each of the sides having a ramp (15A, 15B, 112, 122) adapted to engage a gripping member (84, 73) of the second member of the frame/support group when the assembly is translationally moved from the first to the second end, said ramps being adapted to separate the support from the frame during said translational movement by bearing on said gripping member of the second member of the frame/support group, the first member of the frame/support group then bearing on the bearing means, such that the frame and the support are separated once the translational movement has arrived at the second end.