A closing device for a drawer comprising an elongate hollow housing which includes front and rear portions, a rotating member slidably mounted in the front portion and a resilient member mounted in the rear portion. The front portion includes first and second portions with the first portion having a rotation-preventing internal surface and the second portion having a rotation-admitting internal surface. A locking step is defined by the differing internal cross sections of the first and second portions. The rotation of the rotating member in the first portion is prevented by the internal shape of the first portion relative to the external shape of the rotating member. The rotating member has an angular slot for receiving a guiding pin which is downwardly extending from the bottom surface of a top roller guide.