A float textile having an improved optical interference function, containing a float texture yarn formed by combining three or more multi-filament yarns each comprising, as a constituent unit, optically interfering mono-filaments which are formed by alternately laminating layers of at least two polymers having different refractive indices and which have flattening ratio of 4 to 15 and by interlacing the multi-filament yarns to form 20 or less interlaces per meter, used as a warp float and/or weft float component, and having a float number of 2 or more. A spun-dyed textile which is formed by combining a large number of optically interfering multi-filament yarns can provide a float textile which can exhibit a bright color development effect and can expand the utility thereof to room interior and car interior fields.