Device for driving two mold half holders of a glass molding machine On a glass molding machine (5) holders (2; 3) are pivotally mounted about an axis (4). Each holder (2; 3) has mold tool halves (6; 7). A first joint bar (10) is articulated at a first articulation point (9) of each holder (2; 3). A second joint bar (12) is articulated at a second articulation point (11) of the first joint bar (10), which second joint bar is articulated for its part at a third articulation point (13) of the glass molding machine (5). A rod (14) is also articulated at the second articulation point (11) and is articulated with its other end at a crank pin (15) of a crank (16). Each of the two cranks (16) is coaxially connected to a toothed wheel (17; 18). The toothed wheels (17; 18) are in engagement with a worm (21) on diametrically opposite sides, which worm can be rotationally driven in a reciprocating manner by an electric servomotor (29) via a gear mechanism (30).