A fishing spinning reel, comprising: a rotor rotated by rotational operation of a handle to wind a fishing line around a spool; a line roller through which the fishing line is guided to the spool; a magnetic fluid sealed bearing in which a magnetic fluid seal is provided integrally with a bearing, wherein the line roller is rotatably supported on a supporting shaft through the magnetic fluid sealed bearing, the magnetic fluid sealed bearing comprising: a bearing body having an inner ring made of a magnetic material, an outer ring made of a magnetic material, and a rolling member placed between the inner ring and the outer ring so as to be rollable; and the magnetic fluid seal retained integrally with the bearing body and forming a magnetic circuit with the inner ring or the outer ring to seal an inside of the bearing body, the magnetic fluid seal being provided on both sides of the bearing body; wherein the magnetic fluid seal includes a magnet forming the magnetic circuit with the inner ring or the outer ring, a retaining plate retaining the magnet, and a magnetic fluid; wherein the magnetic fluid includes an outer ring magnetic fluid retained between the outer ring and the retaining plate or the magnet; wherein the magnetic fluid sealed bearing and a collar are disposed between an inner surface of the line roller and the outer surface of the supporting shaft, and the magnetic fluid sealed bearing and the collar are arranged alongside in the axial direction of the line roller with a certain space therebetween; and wherein opposing ends of the magnetic fluid sealed bearing and the collar that face to each other contact with either end of a catch; characterized in that the magnet and the retaining plate are arranged between the inner ring and the outer ring, respectively; that the magnetic fluid further includes an inner ring magnetic fluid retained between the inner ring and the retaining plate or the magnet; and that the catch is formed as a projecting portion of the inner surface of the line roller. a rotor rotated by rotational operation of a handle to wind a fishing line around a spool; a line roller through which the fishing line is guided to the spool; a magnetic fluid sealed bearing in which a magnetic fluid seal is provided integrally with a bearing, wherein the line roller is rotatably supported on a supporting shaft through the magnetic fluid sealed bearing, the magnetic fluid sealed bearing comprising: a bearing body having an inner ring made of a magnetic material, an outer ring made of a magnetic material, and a rolling member placed between the inner ring and the outer ring so as to be rollable; and the magnetic fluid seal retained integrally with the bearing body and forming a magnetic circuit with the inner ring or the outer ring to seal an inside of the bearing body, the magnetic fluid seal being provided on both sides of the bearing body; a bearing body having an inner ring made of a magnetic material, an outer ring made of a magnetic material, and a rolling member placed between the inner ring and the outer ring so as to be rollable; and the magnetic fluid seal retained integrally with the bearing body and forming a magnetic circuit with the inner ring or the outer ring to seal an inside of the bearing body, the magnetic fluid seal being provided on both sides of the bearing body; wherein the magnetic fluid seal includes a magnet forming the magnetic circuit with the inner ring or the outer ring, a retaining plate retaining the magnet, and a magnetic fluid; wherein the magnetic fluid includes an outer ring magnetic fluid retained between the outer ring and the retaining plate or the magnet; wherein the magnetic fluid sealed bearing and a collar are disposed between an inner surface of the line roller and the outer surface of the supporting shaft, and the magnetic fluid sealed bearing and the collar are arranged alongside in the axial direction of the line roller with a certain space therebetween; and wherein opposing ends of the magnetic fluid sealed bearing and the collar that face to each other contact with either end of a catch; characterized in that the magnet and the retaining plate are arranged between the inner ring and the outer ring, respectively; that the magnetic fluid further includes an inner ring magnetic fluid retained between the inner ring and the retaining plate or the magnet; and that the catch is formed as a projecting portion of the inner surface of the line roller.