A brush seal assembly may seal a gap between a diaphragm and a rotor (5) of a turbine. The brush seal assembly includes a brush (200), one end of which is inserted in a rotor facing surface of a diaphragm (4) while the other end thereof protrudes toward a rotor, and a support strip (300) spaced apart from one side of the brush so that one side end portion (310c) of the support strip is fixed and the other side end portion (330c) thereof supports the first side (230) of the brush.
