Sliding door device for closing a wall opening with a sliding door, which is laterally displaceable along an upper guide rail and a lower guide rail between a closed position, in which the wall opening is closed, and an open position, in which the wall opening is laid open, which is connected on the upper side to at least one upper carriage, which is held displaceably by the upper guide rail, and which is connected on the lower side to at least one lower carriage, which is held displaceably by the lower guide rail, and which comprises at least one actuating mechanism, with which the sliding door is lockable in the closed position, wherein the actuating mechanism serves for actuating at least one slidable locking bar which is provided for locking the sliding door, wherein two upper carriages each hold an upper cardan shaft and two lower carriages each hold an lower cardan shaft, wherein two crankshafts are provided parallel to each other and spaced apart from each other, which are rotatably but axially non-displaceably connected to and hold the sliding door, whose upper end piece is each firmly connected to an upper articulated lever, which is rotatably held by the upper cardan shaft of the associated upper carriage, whose lower end piece is each firmly connected to a lower articulated lever, which is rotatably held by the lower cardan shaft of the associated lower carriage, and which are each couplable or coupled by means of a coupling device to the at least one locking bar or each to a locking bar, characterised in, that the crankshafts are drivable by the locking bar during the process of locking or unlocking the sliding door, in order to rotate the upper and lower articulated lever (32, 31) and to lift the unlocked sliding door off the wall opening or to lower it onto the wall opening. which is laterally displaceable along an upper guide rail and a lower guide rail between a closed position, in which the wall opening is closed, and an open position, in which the wall opening is laid open, which is connected on the upper side to at least one upper carriage, which is held displaceably by the upper guide rail, and which is connected on the lower side to at least one lower carriage, which is held displaceably by the lower guide rail, and which comprises at least one actuating mechanism, with which the sliding door is lockable in the closed position, wherein the actuating mechanism serves for actuating at least one slidable locking bar which is provided for locking the sliding door, wherein two upper carriages each hold an upper cardan shaft and two lower carriages each hold an lower cardan shaft, wherein two crankshafts are provided parallel to each other and spaced apart from each other, which are rotatably but axially non-displaceably connected to and hold the sliding door, whose upper end piece is each firmly connected to an upper articulated lever, which is rotatably held by the upper cardan shaft of the associated upper carriage, whose lower end piece is each firmly connected to a lower articulated lever, which is rotatably held by the lower cardan shaft of the associated lower carriage, and which are each couplable or coupled by means of a coupling device to the at least one locking bar or each to a locking bar, characterised in, that the crankshafts are drivable by the locking bar during the process of locking or unlocking the sliding door, in order to rotate the upper and lower articulated lever (32, 31) and to lift the unlocked sliding door off the wall opening or to lower it onto the wall opening.