To provide a pocket coil spring structure assembling apparatus that has high productivity while making stop time of the pocket coil spring structure assembling apparatus as short as possible by simply performing replenishment or replacement of a row of pocket coil spring be performed simply and in a short period of time without spending much time and labor.

By connecting a row-of-pocket-coil-springs auxiliary feed stock mechanism 2 with a row-of-pocket-coil-springs delivery mechanism 3 in series, a row-of-pocket-coil-springs supply units I, II, III are formed. A plurality of the row-of-pocket-coil-springs supply units I, II, III are arranged on the upstream side of a sealing/cutting mechanism 4. A control mechanism alternatively selects a row-of pocket-coil-springs supply unit which faces the sealing/cutting mechanism 4 from the plurality of the row-of-pocket-coil-springs supply units I, II, III, and the selected row-of-pocket-coil-springs supply unit I, II, III is moved to face the sealing/cutting mechanism 4.