A steering device configured to apply an assisting force to a steering mechanism by a motor, the steering device comprising: a housing; a steering rod accommodated in the housing to be allowed to reciprocate in an axial direction; a power transmission mechanism, which includes a rotating member (231,242) configured to rotate by the motor and is configured to convert a rotation of the rotating member (231,242) into a reciprocating motion of the steering rod thereby to transmit the reciprocating motion to the steering rod; and a rolling-element bearing, which rotationally supports the rotating member (231,242) in the housing, wherein the rolling-element bearing includes an inner ring, an outer ring (73,123,251), first rolling elements, and second rolling elements, the first rolling elements and the second rolling elements are disposed side by side in an axial direction between the inner ring and the outer ring, the inner ring includes a first split race having a first inner peripheral track surface (91,134,253a), on which the first rolling elements roll, and a second split race having a second inner peripheral track surface, on which the second rolling elements roll, and the steering device further includes a fixing structure configured to fix the rolling-element bearing to an outer periphery of the rotating member (231,242) in a state where a load in the axial direction is applied to the first split race, the first rolling elements, the outer ring, the second rolling elements, and the second split race, the fixing structure includes a groove portion (231a,231d,231h) provided so as to be adjacent to the rolling-element bearing on an outer peripheral surface of the rotating member, and a holding member (260,262,263) fitted into the groove portion (231a,231d,231h), in a state where the holding member (260,262,263) is in contact with an end face of the inner ring and a stepped surface (231c,231f,231j) of the groove portion (231a,231d,231h) facing the end face to apply a biasing force in the axial direction to the end face of the inner ring, the holding member (260,262,263) is fitted to the groove portion (231a,231d,231h) toward an inner side in a radial direction orthogonal to the axial direction, and the holding member includes a first end portion, which contacts the end face of the inner ring, and a second end portion, characterized in that the second end portion is in close contact with the stepped surface by being swaged into the groove portion so as to be deformed inward in the radial direction. a housing; a steering rod accommodated in the housing to be allowed to reciprocate in an axial direction; a power transmission mechanism, which includes a rotating member (231,242) configured to rotate by the motor and is configured to convert a rotation of the rotating member (231,242) into a reciprocating motion of the steering rod thereby to transmit the reciprocating motion to the steering rod; and a rolling-element bearing, which rotationally supports the rotating member (231,242) in the housing, wherein the rolling-element bearing includes an inner ring, an outer ring (73,123,251), first rolling elements, and second rolling elements, the first rolling elements and the second rolling elements are disposed side by side in an axial direction between the inner ring and the outer ring, the inner ring includes a first split race having a first inner peripheral track surface (91,134,253a), on which the first rolling elements roll, and a second split race having a second inner peripheral track surface, on which the second rolling elements roll, and a first split race having a first inner peripheral track surface (91,134,253a), on which the first rolling elements roll, and a second split race having a second inner peripheral track surface, on which the second rolling elements roll, and the steering device further includes a fixing structure configured to fix the rolling-element bearing to an outer periphery of the rotating member (231,242) in a state where a load in the axial direction is applied to the first split race, the first rolling elements, the outer ring, the second rolling elements, and the second split race, the fixing structure includes a groove portion (231a,231d,231h) provided so as to be adjacent to the rolling-element bearing on an outer peripheral surface of the rotating member, and a holding member (260,262,263) fitted into the groove portion (231a,231d,231h), a groove portion (231a,231d,231h) provided so as to be adjacent to the rolling-element bearing on an outer peripheral surface of the rotating member, and a holding member (260,262,263) fitted into the groove portion (231a,231d,231h), in a state where the holding member (260,262,263) is in contact with an end face of the inner ring and a stepped surface (231c,231f,231j) of the groove portion (231a,231d,231h) facing the end face to apply a biasing force in the axial direction to the end face of the inner ring, the holding member (260,262,263) is fitted to the groove portion (231a,231d,231h) toward an inner side in a radial direction orthogonal to the axial direction, and the holding member includes a first end portion, which contacts the end face of the inner ring, and a second end portion, characterized in that a first end portion, which contacts the end face of the inner ring, and a second end portion, characterized in that the second end portion is in close contact with the stepped surface by being swaged into the groove portion so as to be deformed inward in the radial direction.