A partition which allows using the place where the front passenger seats are located by increasing the cargo space in commercial vehicles, comprising - a left partition which can be provided behind the driver seat and has a wire net on its upper part allowing to see the cargo space in the back, and a fixed sheet panel on its lower part preventing the materials in the cargo space from passing towards the driver seat, - a right partition which can be provided behind the front passenger seats and has a wire net on its upper part allowing to see the cargo space in the back, and a further sheet panel on its lower part preventing the materials in the cargo space from passing towards the driver seat, and characterized in that - the partition has a sliding mechanism, - the fixed sheet panel of the left partition is a fixed sheet metal panel, - the further sheet panel of the right partition is a moving sheet metal panel, - at least one upper guide is attached to the partitions (2, 4) such that it will extend along the edges of the fixed sheet metal panel and the moving sheet metal panel corresponding to the wire nets, and has a C form cross section such that its open surface will face the cargo space in the mounted state of the partition, - at least one lower guide is attached to the partitions (2, 4) such that it will extend along the edges of the fixed sheet metal panel and the moving sheet metal panel corresponding to the vehicle floor, and has a C form cross section such that its open surface will face the cargo space in the mounted state of the partition, - at least one upper roller extends inside the moving metal sheet panel from the upper guide through its open part and enables the moving sheet metal panel to hold onto upper guide and to be slid right and left according to the vehicle axis inside the upper guide, in the mounted state of the partition, - at least one lower roller extends inside the moving metal sheet panel from the lower guide through its open part and enables the moving sheet metal panel to hold onto lower guide and to be slid right and left according to the vehicle axis inside the lower guide, in the mounted state of the partition, - at least one lock is positioned on the moving sheet metal panel such that it will be close to at least one of the guides (6, 7), which has a slot having a channel in the horizontal axis, at least one shaft moving up/down inside the slot, an opening located on the side surface of the slot, and at least one extension coupled vertically to the shaft, going out of the slot over the opening and allowing the user moving the shaft, - at least one hole is located on the guide (6, 7) to which the lock is close and has the width wherein the shaft inside the lock can enter, and enables the moving sheet metal panel to be fixed when the shaft enters therein and to limit the sliding movement. - a left partition which can be provided behind the driver seat and has a wire net on its upper part allowing to see the cargo space in the back, and a fixed sheet panel on its lower part preventing the materials in the cargo space from passing towards the driver seat, - a right partition which can be provided behind the front passenger seats and has a wire net on its upper part allowing to see the cargo space in the back, and a further sheet panel on its lower part preventing the materials in the cargo space from passing towards the driver seat, and characterized in that - the partition has a sliding mechanism, - the fixed sheet panel of the left partition is a fixed sheet metal panel, - the further sheet panel of the right partition is a moving sheet metal panel, - at least one upper guide is attached to the partitions (2, 4) such that it will extend along the edges of the fixed sheet metal panel and the moving sheet metal panel corresponding to the wire nets, and has a C form cross section such that its open surface will face the cargo space in the mounted state of the partition, - at least one lower guide is attached to the partitions (2, 4) such that it will extend along the edges of the fixed sheet metal panel and the moving sheet metal panel corresponding to the vehicle floor, and has a C form cross section such that its open surface will face the cargo space in the mounted state of the partition, - at least one upper roller extends inside the moving metal sheet panel from the upper guide through its open part and enables the moving sheet metal panel to hold onto upper guide and to be slid right and left according to the vehicle axis inside the upper guide, in the mounted state of the partition, - at least one lower roller extends inside the moving metal sheet panel from the lower guide through its open part and enables the moving sheet metal panel to hold onto lower guide and to be slid right and left according to the vehicle axis inside the lower guide, in the mounted state of the partition, - at least one lock is positioned on the moving sheet metal panel such that it will be close to at least one of the guides (6, 7), which has a slot having a channel in the horizontal axis, at least one shaft moving up/down inside the slot, an opening located on the side surface of the slot, and at least one extension coupled vertically to the shaft, going out of the slot over the opening and allowing the user moving the shaft, - at least one hole is located on the guide (6, 7) to which the lock is close and has the width wherein the shaft inside the lock can enter, and enables the moving sheet metal panel to be fixed when the shaft enters therein and to limit the sliding movement.