A paper clip removing device capable of removing a paper clip made of a shape memory alloy, that has such a shape that a plurality of documents are bound at a normal temperature and a document bundle is released in a heated state, when the paper clip is on any positions on an end side of a document is provided. When a paper clip made of a shape memory alloy, that has such a shape that a plurality of documents are bound at a normal temperature and a document bundle is released in a heated state, is removed, the paper clip removing device detects a position of the paper clip to heat the paper clip and deforms the paper clip into a shape of releasing a document bundle to attract and remove the paper clip, resulting that the paper clip is collected in the collecting box.