ACTIVE CASTER

To provide an active caster that facilitates replacement of a wheel. An active caster according to the present disclosure is adapted to enable steering of a single wheel by interference drive. An active caster includes a vertically extending steering axis, a horizontally extending axle, and a wheel connected to the axle. The active caster has both an offset s of the axle with respect to the steering axis T in a horizontal direction orthogonal to a direction in which the axle extends, and an offset d of the wheel with respect to the steering axis T in a direction in which the axle extends.