The invention relates to a device (100) for measuring a shear stress of a fluid. The device (100) comprises an inlet section (101) through which the fluid is guidable, wherein the inlet section (101) is formed such that the fluid streams through the inlet section (101) along a first streaming direction (102). A tube (103) is connected to the inlet section (101) such that the fluid is streamable from the inlet section (101) through the tube (103), wherein the tube (103) comprises a transition section (104) which is formed such that the fluid streaming through the tube (103) is deflected from the first streaming direction (102) to a second streaming direction (105). The first streaming direction (102) differs to the second streaming direction (105), wherein the tube (103) is formed such that the tube (103) is deformable by deflecting the fluid from the first streaming direction (102) to the second streaming direction (105) within the transition section (104). A deformation sensor (106) measures a deformation of the tube (103), wherein the measured deformation is indicative of the shear stress of the fluid.