There is described a device for measuring deformations (10) on surfaces endowed with a frame (11) associated to fastening means (20) of the device (10) on the surfaces, the device (10) further comprising, at least a pair of guides (31, 32) associated longitudinally to an inner portion (12) of the frame (11) and spaced apart parallel to each other, and a sliding support (40) perpendicularly associated to the guides (31, 32); the sliding support (40) comprising a transversal groove (41) on which there is disposed a mobile base (42) that receives a measuring element (50).