Abstract: A spacer device for insulating glass windows (50) includes a tubular element (1), having side walls (11) fit to mate, in an assembled condition (A) of the glass window (50), respective glass plates (3) and having external (12) and internal (13) walls with respect to the glass window (50). The spacer device (100) further includes: coating means (6) fixed at least to a longitudinal portion of the tubular element (1); at least a longitudinal portion (8) of each side wall (11) adjacent to the external wall (12) without the coating means (6); gasket means (4) fit to be interposed, in the assembled condition (A), between a plate (3) and the longitudinal portion (8) of the respective side wall (11), adhering at least on said plate (3) and portion (8). The side walls (11) of each tubular element (1) are convergent.