To obtain a packed mass reduced in volume by being compressed.

The rear end of a press block is moved. The pressure of a cylinder is held to continue pressing an object to be compressed. In this state, the support base 41 of a pulling and rotating means 40 is slid to cause an arm 44 to guide a wire and, at the same time, the leading end 46 of an arm 44 is moved toward a slit 23a side via the slit of the press block from the five slit 23b side of a compression chamber. The wire is placed upon another wire laid on the sidewall 20a of the compression chamber, and they are conveyed to a twister means 50 side.