The invention relates to a filter unit (2) for a the air purification device, comprising a ionization unit (22), including a housing (200), at least one elongate ionization (220) and at least a grounded electrode (221), and a separation unit (21), which the ionization unit (22) is connected downstream in the direction of flow and at least one collecting electrode (211) and at least one counter electrode (210) comprises. The filter unit (2) is characterized in that the housing (200) of the ionization unit (22) has an air inlet opening (200), which is facing away from a separation unit (21), and in that the grounded electrode (221) the air inlet opening (200) at least partially covers made of an air-permeable material, an at least partly curved cross-sectional shape and the at least one ionization (220) at least partially surrounds. In addition, a the air purification device (1) with at least one filter unit (2) described.
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