The present invention is related to a shock-absorbing packing material inflated with air and to an apparatus for manufacturing the shock-absorbing packing material. As polystyrene plastic typically used for a shock-absorbing material becomes difficult to use because of environmental pollution, a shock-absorbing means that are formed by compiling plastic films or sheets, bonding them using heat or high frequency waves, and then inflating it by injecting air between the films are often used. However, it was difficult to develop an apparatus for manufacturing these shock-absorbing means with substantially high economical efficiency. Accordingly, the invention provides an apparatus for manufacturing a shock-absorbing material with economical efficiency, and enhanced productivity without looseness or extension, as the plastic sheet or films rolled on a plurality of rolls are bonded by heat at a constant interval while unrolling them.