Easily transported and assembled wall structure with or for sliding door, comprising elongate constructional elements (21,10,10A,11,11A) destined to be operatively connected to a peripheral frame, said peripheral frame being of the type having a plurality of interconnected elongated elements joined together comprising a first, a second, a third peripheral element (2,3,4), to opposing faces (7,8) of said interconnected elongated elements there being destined to be fixed wall panels (14,15), a compartment being so defined between said wall panels (14,15) into which a sliding door can slide to be contained therein, said elongate constructional elements (21,10,10A,11,11A) being destined to be located proximate to said peripheral elements (2,3,4), a first set of said elongate constructional elements defining guide means for guiding the door during its sliding movement and a second set of said elongate constructional elements defining rectilinear support means (10,10A,11,11A) for supporting the wall panels (14,15), said guide means comprising at least a rail section to be connected to a horizontal part of the peripheral frame, specifically the second peripheral element, said rectilinear support means comprising a first, a second, a third and a fourth rectilinear support element (10,10A,11,11A) forming two pairs, the wall structure further comprising, for the first, second, third and fourth rectilinear support element (10,10A,11,11A), a respective first, second, third and fourth end element (100,100A,110,110A) to be engaged with a first extremity of the respective rectilinear support element (10,10A,11,11A) located on the opposite side with respect to a second extremity of said respective rectilinear support element (10,10A,11,11A), each end element (100,100A,110,110A), in turn, comprising: - a main body having first axial coupling means which, by interacting along a direction from the first to the second extremity of the respective rectilinear support element (10, 10A, 11, 11A) with second axial coupling means provided on the first extremity of said respective rectilinear support element (10,10A,11,11A), determine the connection of said respective rectilinear support element (10,10A,11,11A) with the end element (100,100A,110,110A); - a head comprising one or more engagement portions for engagement with a respective elongate side of the guide means; mutual interference means being provided on the engagement portions and on the respective elongated side of the guide means which, upon engagement of the engagement portions with the respective elongated side slidingly engage the end element (100,100A,110,110A) and the thereto connected, respective rectilinear support element (10,10A,11,11A) with the guide means before being finally fixed, at the same time impeding at least both a movement of the end element (100, 100A,110,110A) with the thereto connected, respective rectilinear support element (10,10A,11,11A) along the direction from the first to the second extremity of said respective rectilinear support element (10,10A,11,11A), and a rotation of said respective rectilinear support element (10,10A,11,11A) around its second extremity; the wall structure being characterized in that by virtue of the coupling between the guide means and the horizontal part of the peripheral frame, specifically the second peripheral element, the engagement between the engagement portions of the heads of the end elements (100,100A,110,110A) of the pairs of rectilinear support elements (10,10A,11,11A) and the respective elongated sides of the guide means, becomes an engagement between the pairs of rectilinear support elements (10,10A,11,11A) and the horizontal part of the peripheral frame, specifically the second peripheral element. - a main body having first axial coupling means which, by interacting along a direction from the first to the second extremity of the respective rectilinear support element (10, 10A, 11, 11A) with second axial coupling means provided on the first extremity of said respective rectilinear support element (10,10A,11,11A), determine the connection of said respective rectilinear support element (10,10A,11,11A) with the end element (100,100A,110,110A); - a head comprising one or more engagement portions for engagement with a respective elongate side of the guide means; mutual interference means being provided on the engagement portions and on the respective elongated side of the guide means which, upon engagement of the engagement portions with the respective elongated side slidingly engage the end element (100,100A,110,110A) and the thereto connected, respective rectilinear support element (10,10A,11,11A) with the guide means before being finally fixed, at the same time impeding at least both a movement of the end element (100, 100A,110,110A) with the thereto connected, respective rectilinear support element (10,10A,11,11A) along the direction from the first to the second extremity of said respective rectilinear support element (10,10A,11,11A), and a rotation of said respective rectilinear support element (10,10A,11,11A) around its second extremity;