The invention relates to an apparatus for producing fermented milk-based preparations, in particular liquid fermented preparations, comprising a main housing (1) defining a recess having an upper opening (3), a removable vessel (4) inserted at least partially into the recess, an inner cover (5) associated with the vessel (4), a main cover (6) associated with the main housing (1), the main housing (1) having an outer shell (11) and an inner wall (12) defining an inner chamber (10) housing a heating device (20) including side heating means (21), the side heating means (21) including at least one side heating wire (24) wound in a spiral by a plurality of turns around the inner wall (12). According to the invention, the inner wall (12) has at least one series of shaped portions (41) defining cavities (42) for positioning the side heating wire (24).
