Provided is a method for efficiently manufacturing a heat-shrinkable cylindrical label by ultrasonic welding. The manufacturing method comprises: Preparing a heat-shrinkable film having a first direction and a second direction orthogonal to the first direction and including a plurality of portions to be heat-shrinkable cylindrical labels along the second direction. Overlapping one end and the other end of the heat-shrinkable film so that the front and rear surfaces of the heat-shrinkable film face each other to form an overlapping portion extending along the second direction, and continuously welding at least a portion of the overlapping portion in the second direction by ultrasonic welding to form a seal line extending continuously along the second direction. Forming the seal line includes conveying the heat-shrinkable film at a constant speed along a second direction relative to a vibrator of the ultrasonic welding machine, the speed being 100 m/min or more and less than...

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