To provide a nonwoven fabric for filters having high stiffness, having small deformation by fluid resistance when filtering operation is carried out, having good releasability from dust and long life and excellent in filter performances, and to provide a filter using the nonwoven fabric.

The polyester conjugated nonwoven fabric is obtained by integrally laminating a filament nonwoven fabric A having 10-50 g/m2 weight in which fibers having 7-15μm fiber diameters are mainly arranged in ranges of angles of ±15 ° along the center line in the longitudinal direction of a sheet, a nonwoven fabric B having 15-270 g/m2 of basis weight and composed of a core-sheath type conjugate fiber having 7-50 μm fiber diameter in which a low melting point polyester having 110-250 °C melting point is used as a sheath component and a polyester having 180-300 °C melting point and a polyester nonwoven fabric C having 30-200 g/m2 of basis weight so that the filament nonwoven fabric A becomes a surface layer material.