A device is provided for producing milk foam, in particular in combination with an automatic coffee machine, which has a mixing chamber (13) to which milk, air, and rinsing medium can be supplied via various supply lines (11, 20, 21), wherein the supply of the rinsing medium to the mixing chamber takes place at least partially via the milk supply line (11). Here it is essential that the air supply line (20), at least with its end segment (20a) connected to the mixing chamber (13), can be selectively connected via a valve (22) to a line (23) having rinsing medium.