NOVELTY - An organic waste composting device (1) comprises a container (2) having a first portion (2a) for inserting organic materials and a second portion (2c) for discharging compost. The container also has at the first portion an aeration outlet (4). The container further comprises at the second portion a vent (10) for expelling the gases produced by the organic materials. The vent is selectively connectable in fluid communication with the aeration outlet. The composting device further comprises a filter (18) positioned upstream of the first portion.    USE - Organic waste composting device.    ADVANTAGE - The composting device is able to reduce to a minimum the possibility of inserting non-organic waste in the device by providing the filter upstream of the opening of the container. The filter can prevent non-organic objects such as caps, cutlery and plates, which are erroneously supplied to the composting device, from being inserted in the container so that only organic waste is processed. Thus, the action of the filter can improve efficiency of the composting device. Further, the composting device is capable of breaking down waste of an organic nature coming from private household kitchens or catering establishments such as food waste, or from geographical areas subject to the separate collection of waste. The compost produced by the composting device is returned to the same supplier of the organic materials.    DETAILED DESCRIPTION - An organic waste composting device (1) comprises a container (2) having a first portion (2a) for inserting organic materials and a second portion (2c) for discharging compost. The container also has at the first portion an aeration outlet (4) which can be connected with the outside environment for introducing at least air inside the first portion of the container. The container further comprises at the second portion a vent (10) for expelling the gases produced by the organic materials and a unit for moving the organic materials from the first portion to the second portion. The vent is selectively connectable in fluid communication with the aeration outlet for introducing the gases in the first portion of the container. The composting device further comprises a filter (18) positioned upstream of the first portion.    DESCRIPTION OF DRAWING(S) - The drawing shows a side view partly in cross-section of the organic waste composting device.    Organic waste composting device (1)    Container (2)    First portion (2a)    Second portion (2c)    Aeration outlet (4)    Vent (10)    Filter (18)