Abstract: The present invention is a rotary stamp. It comprises a U-shaped frame, a shaft rotatably inserted in the frame, a bridge mounted on the frame, cylinder means fitted on the shaft and operation means for rotating the shaft. An endless belt-like stamping member is mounted around the cylinder means and the bridge. The cylinder means has flanges at both ends having knurls around the circumferences thereof. On the inner side of the frame elastic plates are provided, each plate having on its lower end a pawl to be engaged by one of the knurls on the flanges of the cylinder means.