<p>A wheel device (2) for a frame (32) includes a wheel unit (21) and a coupling unit (22) for coupling the wheel unit (21) to the frame (32). The coupling unit (22) includes an upright tubular sleeve (221) mounted fixedly on the frame (32), a support axle (222) extending movably through the tubular sleeve (221) and having a bottom end connected to the wheel unit (21), and a fastening member (223) extending radially through the tubular sleeve (221) and abutting releasably against the support axle (222) for positioning the support axle (222) in the tubular sleeve (221).</p>
