Foot-lifting device for sofas, comprising: - a fixed element configured to be constrained in substantially vertical position to the front portion of the structure of a sofa; - a footrest which is movable with respect to said fixed element between a closed configuration and an open configuration; - a connection kinematism of said footrest to said fixed element, wherein in a closed configuration said footrest is substantially vertical, in open configuration said footrest is in rotated position upwards and translated onwards with respect to the sofa with respect to the position assumed in closed configuration, characterized in that in both said open and closed configurations the extension of said device is wholly in front of said front portion of the structure of said sofa, and in that said kinematism comprises a chain of four articulated quadrilaterals, wherein: - both the first and the second quadrilateral comprise a side integral to said fixed element; - the first and the second quadrilateral share a rod hinged to said side integral to said fixed element; - the third quadrilateral comprises a rod integral to a rod of said first quadrilateral, and a rod integral to a rod of the second quadrilateral; - the fourth quadrilateral comprises two rods (8, 9) integral to the rods of said third quadrilateral not integral to rods of said first and second quadrilateral. - a fixed element configured to be constrained in substantially vertical position to the front portion of the structure of a sofa; - a footrest which is movable with respect to said fixed element between a closed configuration and an open configuration; - a connection kinematism of said footrest to said fixed element, wherein in a closed configuration said footrest is substantially vertical, in open configuration said footrest is in rotated position upwards and translated onwards with respect to the sofa with respect to the position assumed in closed configuration, characterized in that in both said open and closed configurations the extension of said device is wholly in front of said front portion of the structure of said sofa, and in that said kinematism comprises a chain of four articulated quadrilaterals, wherein: - both the first and the second quadrilateral comprise a side integral to said fixed element; - the first and the second quadrilateral share a rod hinged to said side integral to said fixed element; - the third quadrilateral comprises a rod integral to a rod of said first quadrilateral, and a rod integral to a rod of the second quadrilateral; - the fourth quadrilateral comprises two rods (8, 9) integral to the rods of said third quadrilateral not integral to rods of said first and second quadrilateral. - both the first and the second quadrilateral comprise a side integral to said fixed element; - the first and the second quadrilateral share a rod hinged to said side integral to said fixed element; - the third quadrilateral comprises a rod integral to a rod of said first quadrilateral, and a rod integral to a rod of the second quadrilateral; - the fourth quadrilateral comprises two rods (8, 9) integral to the rods of said third quadrilateral not integral to rods of said first and second quadrilateral.