A food processor (1) with two bowls (20, 21), which are of different constructions and each comprise a bottom wall (22, 31) and a tubular inner portion (28, 34) rising from the bottom wall (22, 31) into the bowl interior, comprises two transmission pieces (60, 61) which are preferably of different constructions and by means of which the formation of an inadmissible combination of a bowl (20, 21) and a tool (42, 45, 46), which can be introduced into the bowl (20, 21) and is associated with one of the bowls (20, 21), can be prevented in a simple manner.