a ni — fe - based alloy brazing filler material is provided comprising , in mass %, fe : 21 to 40 %; cr : 10 to 30 %; p : 7 to 11 %; b : 0 to 5 %; si : 0 to 4 . 5 %; v : 0 to 5 %; co : 0 to 5 %; mo : 0 to 5 %; the balance being ni and unavoidable impurities , wherein the mass ratio of fe to p is in a range of 2 . 6 to 5 . the present invention provides a ni — fe - based alloy brazing filler material having a low melting temperature and a superior corrosion resistance and comprising raw materials that are relatively easily available , for use in manufacture of stainless - steel heat exchangers or the like .