A device (1) associable with a steam dispensing nozzle (2) of a coffee machine (3) for the production of a milk-based beverage, comprising a milk container (4) fitted with a lid (5) in which there is incorporated a mixing device comprising a mixing chamber (6), a channel (7) for the inflow of steam into the mixing chamber (6), a channel (8) for the inflow of milk into the mixing chamber (6), a channel (9) for the inflow of air into the mixing chamber (6), and a channel (10) for dispensing the beverage produced in the mixing chamber, the air inflow channel (9), the milk inflow channel (8), the steam inflow channel (7) and the dispensing channel (10) being made in one piece of elastically deformable rubber.