A 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 the fixed element between a closed configuration and an open configuration; a connection kinematism of the footrest to the fixed element; in a closed configuration the footrest is substantially vertical, in open configuration the footrest is in rotated position upwards and translated onwards with respect to the sofa with respect to the position assumed in closed configuration, in that in both the open and closed configurations the extension of the device is wholly in front of the front portion of the structure of the sofa, and in that the kinematism comprises a chain of four articulated quadrilaterals, wherein: both the first and the second quadrilateral comprise a side integral to the fixed element.