An antibacterial agent characterized by containing a polyelectrolyte complex prepared by reacting a cationic polymer containing N.sup.+ atoms in repeating units thereof and an anionic polymer containing --COO.sup.-, --SO.sub.3.sup.-, or --PO.sub.3.sup.- groups in repeating units thereof, and an antibacterial material carrying the above polyelectrolyte complex on a carrier.

 
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