A robot may include a robot frame having a bottom plate, and a rear caster and a wheel module disposed on the bottom plate, wherein the wheel module may include a link base mounted in the bottom plate to be spaced apart from the rear caster, a rotation damper mounted in the link base and having an elastic member accommodated therein, a front link connected to the rotation damper through a connecting shaft, a front caster mounted in a front portion of the front link, a drive motor mounted in a rear portion of the front link, and a drive wheel configured to be rotated by the drive motor.