Lift apparatus comprising: - at least an anchor assembly fixable to the frame of a vehicle; - a platform suitable to support a wheelchair; - at least a support assembly mechanically connected to said platform; - two arms, each connected to said support assembly to support said platform; said arms being rotatably connected to said anchor assembly to rotate with respect to the latter, between a rest configuration and an operating configuration; said platform comprises two parts (121, 122), of which, each has a support surface (121a, 122a) for a wheelchair, a back (121b, 122b) opposite said support surface ( 121a, 122a) and a lateral edge (121c, 122c) along which said parts (121, 122) are mutually hinged to rotate mutually between a close configuration, in which the backs (121b, 122b) of said parts (121, 122)) are facing, and an open configuration in which the support surfaces (121a, 122a) of said parts (121, 122) are substantially coplanar to define a support plane for a wheelchair; said lift apparatus comprising actuating means to mutually rotate the parts (121, 122) of said platform from said close configuration to said open configuration and vice versa; said support assembly comprising, for each arm of said arms: - a connecting element, pivoted to said arm; - a first connecting rod element pivoted to said connecting element and to a first of said parts (121, 122); - a second connecting rod element pivoted to said connecting element and to the second of said parts (121, 122);said connecting rod elements (132, 133) being mutually coupled together when said platform is in said close configuration and being divaricated from each other when said platform is in said open configuration, characterized in that, when the lift apparatus is in said open configuration, said second of said parts (121, 122) is interposed between said first of said parts (121, 122) and said anchor assembly, and when the lift apparatus is in said open configuration, said connecting element is intersected by a vertical plane passing through the center of gravity of said platform. - at least an anchor assembly fixable to the frame of a vehicle; - a platform suitable to support a wheelchair; - at least a support assembly mechanically connected to said platform; - two arms, each connected to said support assembly to support said platform; said arms being rotatably connected to said anchor assembly to rotate with respect to the latter, between a rest configuration and an operating configuration; said platform comprises two parts (121, 122), of which, each has a support surface (121a, 122a) for a wheelchair, a back (121b, 122b) opposite said support surface ( 121a, 122a) and a lateral edge (121c, 122c) along which said parts (121, 122) are mutually hinged to rotate mutually between a close configuration, in which the backs (121b, 122b) of said parts (121, 122)) are facing, and an open configuration in which the support surfaces (121a, 122a) of said parts (121, 122) are substantially coplanar to define a support plane for a wheelchair; said lift apparatus comprising actuating means to mutually rotate the parts (121, 122) of said platform from said close configuration to said open configuration and vice versa; said support assembly comprising, for each arm of said arms: - a connecting element, pivoted to said arm; - a first connecting rod element pivoted to said connecting element and to a first of said parts (121, 122); - a second connecting rod element pivoted to said connecting element and to the second of said parts (121, 122);said connecting rod elements (132, 133) being mutually coupled together when said platform is in said close configuration and being divaricated from each other when said platform is in said open configuration, - a connecting element, pivoted to said arm; - a first connecting rod element pivoted to said connecting element and to a first of said parts (121, 122); - a second connecting rod element pivoted to said connecting element and to the second of said parts (121, 122);said connecting rod elements (132, 133) being mutually coupled together when said platform is in said close configuration and being divaricated from each other when said platform is in said open configuration, characterized in that, when the lift apparatus is in said open configuration, said second of said parts (121, 122) is interposed between said first of said parts (121, 122) and said anchor assembly, and when the lift apparatus is in said open configuration, said connecting element is intersected by a vertical plane passing through the center of gravity of said platform.