A device for assembling glass sheets (3, 4; 3', 4') to form insulating glass panes, in which in each case at least two glass sheets (3, 4; 3', 4') are held at a distance from one another by a frame-shaped spacer extending along their edges and are bonded to one another, having the following features: • the device contains two upstanding pressing plates (5, 6; 5', 6'), each with a pressing surface (7, 8); • the pressing surfaces (7, 8) are arranged facing each other on the pressing plates (5, 6; 5', 6'); • at least one of the pressing plates (5; 5', 6') has means for holding a glass sheet on its pressing surface (7, 8); • the two pressing plates (5, 6; 5', 6') are arranged to be displaceable relative to one another in a first spatial direction and in a second spatial direction; • the first spatial direction extends transversely to the pressing surfaces (7, 8) of the pressing plates (5, 6; 5', 6'), and their mutual distance can be varied by displacing at least one of the pressing plates (5; 5') in the first spatial direction; • the second spatial direction extends transversely to the first spatial direction; • the device contains at least one carrier (10; 10') and a guide rail, via which one of the pressing plates (5; 6') is arranged on the carrier (10; 10') so as to be displaceable in the second spatial direction, • the pressing plates (5, 6; 5', 6') are assigned a pressing device for pressing an insulating glass pane that can be positioned between the pressing surfaces (7, 8), • the device comprises a horizontal conveyor arranged in the vicinity of the lower edge of one of the pressing plates (6; 6') for conveying upstanding glass sheets (3, 4; 3', 4') with a conveying direction extending along the lower edge of this pressing plate (6; 6') and transversely to the second spatial direction, • the device contains a supporting device being displaceable in the first and second spatial directions (A, B) for supporting a lower edge of at least one glass sheet (3; 4'), which is associated with the pressing plate (5; 6') displaceable in the second spatial direction and the distance of which to the pressing surface (7; 8) of the other pressing plate (6; 5') and to the horizontal conveyor is variable. • the device contains two upstanding pressing plates (5, 6; 5', 6'), each with a pressing surface (7, 8); • the pressing surfaces (7, 8) are arranged facing each other on the pressing plates (5, 6; 5', 6'); • at least one of the pressing plates (5; 5', 6') has means for holding a glass sheet on its pressing surface (7, 8); • the two pressing plates (5, 6; 5', 6') are arranged to be displaceable relative to one another in a first spatial direction and in a second spatial direction; • the first spatial direction extends transversely to the pressing surfaces (7, 8) of the pressing plates (5, 6; 5', 6'), and their mutual distance can be varied by displacing at least one of the pressing plates (5; 5') in the first spatial direction; • the second spatial direction extends transversely to the first spatial direction; • the device contains at least one carrier (10; 10') and a guide rail, via which one of the pressing plates (5; 6') is arranged on the carrier (10; 10') so as to be displaceable in the second spatial direction, • the pressing plates (5, 6; 5', 6') are assigned a pressing device for pressing an insulating glass pane that can be positioned between the pressing surfaces (7, 8), • the device comprises a horizontal conveyor arranged in the vicinity of the lower edge of one of the pressing plates (6; 6') for conveying upstanding glass sheets (3, 4; 3', 4') with a conveying direction extending along the lower edge of this pressing plate (6; 6') and transversely to the second spatial direction, • the device contains a supporting device being displaceable in the first and second spatial directions (A, B) for supporting a lower edge of at least one glass sheet (3; 4'), which is associated with the pressing plate (5; 6') displaceable in the second spatial direction and the distance of which to the pressing surface (7; 8) of the other pressing plate (6; 5') and to the horizontal conveyor is variable.