A steering apparatus for a vehicle provided with a steering wheel, the steering apparatus comprising: a main housing including a first end portion and a second end portion, and supported in a manner that the main housing is pivotable relative to a vehicle body about a pivoting center at the first end portion; a movable column member accommodated and supported in the main housing in a movable manner in a front-rear direction of the vehicle body; a fixing bracket fixing the second end portion of the main housing to the vehicle body in a state where the fixing bracket supports the second end portion of the main housing in a manner that the second end portion is movable in an up-down direction of the vehicle body relative to the vehicle body; a link mechanism including a first end portion and a second end portion, the first end portion of the link mechanism being supported by the fixing bracket; and a drive mechanism connected to the second end portion of the link mechanism, wherein the drive mechanism includes a motor, a threaded shaft pivotably supported by the second end portion of the main housing and rotated by driving of the motor, and a nut member moving in an axial direction of the threaded shaft in response to rotation of the threaded shaft, characterised in that the nut member is threadedly engaged with the threaded shaft, the nut member includes a female threaded portion including two flat surface portions (51 a, 51 b) which are positioned facing each other and are parallel to the threaded shaft, one of the two flat surface portions (51 a, 51 b) is away from a central axis of the female threaded portion of the nut member by a first predetermined distance and the other one of the two flat surface portions (51 a, 51 b) is away from the central axis by a second predetermined distance, the nut member includes a pivot shaft portion including a rotational axis that is orthogonal to an axis of the female threaded portion, the link mechanism includes at least one bearing portion (423, 424, 425) provided at the second end portion of the link mechanism and rotatably supporting the pivot shaft portion, and the link mechanism includes a spring member (71, 72, 73) arranged between the bearing portion (423, 424, 425) and at least one of the two flat surface portions (51a, 51b) of the female threaded portion, and pressing the female threaded portion in a direction which is orthogonal to the axial direction of the threaded shaft. a main housing including a first end portion and a second end portion, and supported in a manner that the main housing is pivotable relative to a vehicle body about a pivoting center at the first end portion; a movable column member accommodated and supported in the main housing in a movable manner in a front-rear direction of the vehicle body; a fixing bracket fixing the second end portion of the main housing to the vehicle body in a state where the fixing bracket supports the second end portion of the main housing in a manner that the second end portion is movable in an up-down direction of the vehicle body relative to the vehicle body; a link mechanism including a first end portion and a second end portion, the first end portion of the link mechanism being supported by the fixing bracket; and a drive mechanism connected to the second end portion of the link mechanism, wherein the drive mechanism includes a motor, a threaded shaft pivotably supported by the second end portion of the main housing and rotated by driving of the motor, and a nut member moving in an axial direction of the threaded shaft in response to rotation of the threaded shaft, characterised in that the nut member is threadedly engaged with the threaded shaft, the nut member includes a female threaded portion including two flat surface portions (51 a, 51 b) which are positioned facing each other and are parallel to the threaded shaft, one of the two flat surface portions (51 a, 51 b) is away from a central axis of the female threaded portion of the nut member by a first predetermined distance and the other one of the two flat surface portions (51 a, 51 b) is away from the central axis by a second predetermined distance, the nut member includes a pivot shaft portion including a rotational axis that is orthogonal to an axis of the female threaded portion, the link mechanism includes at least one bearing portion (423, 424, 425) provided at the second end portion of the link mechanism and rotatably supporting the pivot shaft portion, and the link mechanism includes a spring member (71, 72, 73) arranged between the bearing portion (423, 424, 425) and at least one of the two flat surface portions (51a, 51b) of the female threaded portion, and pressing the female threaded portion in a direction which is orthogonal to the axial direction of the threaded shaft.