Provided is a steering apparatus for a vehicle including a housing, a rotational shaft rotatably mounted in the housing, a moving member interposed between the rotational shaft and the housing and moved by rotation of the rotational shaft, a first rotation limiter formed inside the housing and configured to limit an amount of a first direction movement of the moving member, thereby limiting an amount of a first direction rotation of the rotational shaft, and a second rotation limiter coupled to the housing and configured to cover an opening of the housing and to limit an amount of a second direction movement of the moving member, thereby limiting an amount of a second direction rotation of the rotational shaft.

A linear motion mechanism includes: a shaft extending along a prescribed axis; a structural member provided with a cavity through which the shaft extends; and a spline nut and a ball screw nut that support the shaft so as to be rotatable about the axis and so as to be movable in a direction of the axis, respectively, with respect to the structural member. The spline nut and the ball screw nut are detachably attached to the structural member from both sides sandwiching the structural member via attachment flanges provided thereon. At least one of the spline nut and the ball screw nut is fixed to, inside the cavity, a power transmission member having an outer diameter larger than an outer diameter of one of the attachment flanges provided thereon and is attached to the structural member via an adapter having a larger outer diameter than the power transmission member.

A linear motion mechanism includes: a shaft extending along a prescribed axis; a structural member provided with a cavity through which the shaft extends; and a spline nut and a ball screw nut that support the shaft so as to be rotatable about the axis and so as to be movable in a direction of the axis, respectively, with respect to the structural member. The spline nut and the ball screw nut are detachably attached to the structural member from both sides sandwiching the structural member via attachment flanges provided thereon. At least one of the spline nut and the ball screw nut is fixed to, inside the cavity, a power transmission member having an outer diameter larger than an outer diameter of one of the attachment flanges provided thereon and is attached to the structural member via an adapter having a larger outer diameter than the power transmission member.