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, and connected to the steering wheel; 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 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, an operation position of the steering wheel at least in the up-down direction of the vehicle body is adjusted in a case where the main housing pivots via the link mechanism in response to driving of the drive mechanism, characterised in that the nut member includes a female threaded portion threadedly engaged with the threaded shaft, and a pivot shaft portion including a rotational axis that is orthogonal to an axis of the female threaded portion and including two flat surface portions (52a, 52b) which are parallel to the rotational axis and which face each other and are away from each other by a predetermined distance, the link mechanism includes a bearing portion (423, 424) provided at the second end portion of the link mechanism and including a bearing hole rotatably supporting the pivot shaft portion, the bearing portion (423, 424) includes a cut-out portion opening from the bearing hole in a direction which is orthogonal to the rotational axis and including two flat surfaces configured to be parallel to the two flat surface portions (52a, 52b), and 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, and connected to the steering wheel; 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 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, an operation position of the steering wheel at least in the up-down direction of the vehicle body is adjusted in a case where the main housing pivots via the link mechanism in response to driving of the drive mechanism, characterised in that the nut member includes a female threaded portion threadedly engaged with the threaded shaft, and a pivot shaft portion including a rotational axis that is orthogonal to an axis of the female threaded portion and including two flat surface portions (52a, 52b) which are parallel to the rotational axis and which face each other and are away from each other by a predetermined distance, the link mechanism includes a bearing portion (423, 424) provided at the second end portion of the link mechanism and including a bearing hole rotatably supporting the pivot shaft portion, the bearing portion (423, 424) includes a cut-out portion opening from the bearing hole in a direction which is orthogonal to the rotational axis and including two flat surfaces configured to be parallel to the two flat surface portions (52a, 52b), and