A vehicle including a vehicle body and a front wheel that is disposed anterior to the vehicle body and that is steerable about a steering axis (Cs), the vehicle body including a vehicle body frame and a steering rotation unit that is supported on the vehicle body frame and that rotates about the steering axis (Cs), the vehicle characterized by comprising: a variable trail length mechanism that varies a trail length (t) of the front wheel , the variable trail length mechanism including: an oscillation unit that is connected with the steering rotation unit so as to be oscillatable in a fore-aft direction and that supports the front wheel ; and a torsion reduction portion that reduces torsion of the oscillation unit in a vehicle width direction through the oscillation unit combined with the steering rotation unit under a condition in which the trail length (t) is changed such that the front wheel is disposed at a rearmost position, wherein the torsion reduction portion includes a fitted portion disposed in the steering rotation unit and a fitting portion that is disposed in the oscillation unit and that can be fitted in the fitted portion , the fitting portion fits in the fitted portion under a condition in which the trail length (t) is changed such that the front wheel is disposed at the rearmost position, characterised in that the fitting portion is a protrusion protruding to a rear, and the fitted portion is a recess in which the protrusion fits.. a variable trail length mechanism that varies a trail length (t) of the front wheel , the variable trail length mechanism including: an oscillation unit that is connected with the steering rotation unit so as to be oscillatable in a fore-aft direction and that supports the front wheel ; and a torsion reduction portion that reduces torsion of the oscillation unit in a vehicle width direction through the oscillation unit combined with the steering rotation unit under a condition in which the trail length (t) is changed such that the front wheel is disposed at a rearmost position, wherein the torsion reduction portion includes a fitted portion disposed in the steering rotation unit and a fitting portion that is disposed in the oscillation unit and that can be fitted in the fitted portion , the fitting portion fits in the fitted portion under a condition in which the trail length (t) is changed such that the front wheel is disposed at the rearmost position, characterised in that the fitting portion is a protrusion protruding to a rear, and the fitted portion is a recess in which the protrusion fits.. an oscillation unit that is connected with the steering rotation unit so as to be oscillatable in a fore-aft direction and that supports the front wheel ; and a torsion reduction portion that reduces torsion of the oscillation unit in a vehicle width direction through the oscillation unit combined with the steering rotation unit under a condition in which the trail length (t) is changed such that the front wheel is disposed at a rearmost position, wherein the torsion reduction portion includes a fitted portion disposed in the steering rotation unit and a fitting portion that is disposed in the oscillation unit and that can be fitted in the fitted portion , the fitting portion fits in the fitted portion under a condition in which the trail length (t) is changed such that the front wheel is disposed at the rearmost position, characterised in that the fitting portion is a protrusion protruding to a rear, and the fitted portion is a recess in which the protrusion fits.. <EOS>