To provide a lattice with a shading screen to which antibacterial and antifouling treatment are performed along the surface of a window provided in an opening of a building.

The lattice with the shading screen has the shading screen 17 arranged along the surface of the window provided in the opening 11 of the building. A photocatalyst layer comprising titanium oxide as a main agent is formed on the surface of the shading screen 17. A viscous peroxotitanic acid solution consisting of a composite solution of a peroxotitanic acid solution and smectite can be cited as an example of the photocatalyst layer.