A locking device (1) for locking a container (2) onto a loading surface, in particular for road vehicles or railway container wagons, with a first locking lever (11) which is arranged pivotably about an shaft (13) oriented perpendicularly to the loading and unloading direction (Z) and which is preloaded in the direction of a basic position of a spring (14), wherein the shaft of the first locking lever (11) is guided displaceably in the loading and unloading direction (Z), and a toggle lever (117) is provided, the toggle lever being coupled pivotably at one end to the first locking lever (11) and at the opposite end pivotably to a fixing point (102) in the housing (10) such that the shaft (13) of the first locking lever (11), in the loading position of said shaft, is displaced towards the corner fitting (20) and, in the basic position of said shaft, is displaced in the opposite direction.