Bidirectional retraction device for two-sided retraction of a sliding door into a middle door position, comprising: a housing, two unidirectional retraction devices that act in opposite directions with one carrier each which is displaceably guided in a guide and can be displaced from a retracted end position against the action of a retraction spring into a locked end position, and with at least one linear damper for damping the retraction movement of the carrier, and a coupling carriage which is guided in a guide of the housing such that it can be moved in a longitudinal direction and can be tilted, and has two spaced-apart coupling elements and is in engagement with the two retracted carriers in a carriage middle position, wherein the coupling carriage carries along one of the carriers in the direction of movement during a movement from the carriage middle position into one or the other direction and at the same time is decoupled from the other carrier by a tilting movement and, finally in a carriage end position, the coupling carriage is decoupled from the carried along locked carrier in the direction of movement and the front coupling element, seen in the direction of movement, is recessed with respect to the rear coupling element and wherein the coupling carriage releases the carrier from the locked end position during movement from the carriage end position back into the carriage middle position and is retracted by it into the carriage middle position, wherein the housing also comprises the guides for the carriers, the carrier is formed in two parts of a guiding element which is linearly guided in the guide of the housing and a tilting element which is linearly and tiltably guided in the guide of the housing and is pivotably mounted on the guiding element, characterized in that the guiding element comprises a plurality of blind bores, and that either one single linear damper or a plurality of parallel linear dampers is/are mounted on the housing for each of the two unidirectional retraction devices, which are each inserted with a piston rod into the blind bores of the guiding element and are thereby mounted to the housing independently of the carriers. a housing, two unidirectional retraction devices that act in opposite directions with one carrier each which is displaceably guided in a guide and can be displaced from a retracted end position against the action of a retraction spring into a locked end position, and with at least one linear damper for damping the retraction movement of the carrier, and a coupling carriage which is guided in a guide of the housing such that it can be moved in a longitudinal direction and can be tilted, and has two spaced-apart coupling elements and is in engagement with the two retracted carriers in a carriage middle position, wherein the coupling carriage carries along one of the carriers in the direction of movement during a movement from the carriage middle position into one or the other direction and at the same time is decoupled from the other carrier by a tilting movement and, finally in a carriage end position, the coupling carriage is decoupled from the carried along locked carrier in the direction of movement and the front coupling element, seen in the direction of movement, is recessed with respect to the rear coupling element and wherein the coupling carriage releases the carrier from the locked end position during movement from the carriage end position back into the carriage middle position and is retracted by it into the carriage middle position, wherein the housing also comprises the guides for the carriers, the carrier is formed in two parts of a guiding element which is linearly guided in the guide of the housing and a tilting element which is linearly and tiltably guided in the guide of the housing and is pivotably mounted on the guiding element, characterized in that the guiding element comprises a plurality of blind bores, and that either one single linear damper or a plurality of parallel linear dampers is/are mounted on the housing for each of the two unidirectional retraction devices, which are each inserted with a piston rod into the blind bores of the guiding element and are thereby mounted to the housing independently of the carriers.