To provide an air curtain apparatus capable of purifying a whole of indoor air by a photocatalyst without enlarging the apparatus.

A photocatalyst dispersing device 2 dispersing photocatalytic particle containing liquid toward an air flow blown out of an air blow-out opening 8 is attached to a casing 1 of the air curtain apparatus including a blow fan 3. In the photocatalyst dispersing device 2, a dispersing handle connected to a housing vessel of the photocatalytic particle containing liquid is intermittently driven by a motor to disperse the photocatalytic particle containing liquid. It is preferable that a photocatalytic particle with apatite attached to a surface of titanium dioxide is used as the photocatalyst. A whole room can be deodorized/purified.

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