A device for assembling electronic circuits comprises a placing station (7) for placing circuit components on a circuit carrier (1) held at a placing location (17), a fixing station (19) for fixing the circuit components to the circuit carrier (1) under the effect of heat, and a belt conveyor means (9) for conveying a circuit carrier from the placing location (17) to a take-over location (29) of the fixing station (19). The fixing station (19) comprises a heatable zone (22) and a manipulator (21) for raising the circuit carrier (1) from the take-over location (29) and placing it in the heatable zone (22). A continuous belt conveyor (9) of the belt conveyor means extends from the placing location (17) up to the take-over location (29).