Chill a metal loaf pan in the freezer.
Whisk sweetened condensed milk, Nutella, and salt together.
Beat the heavy cream till stiff.
Fold half the whipped cream into the Nutella mixture until combined, then pour back into the whipped cream mixture and mix thoroughly.
Line chilled loaf pan with parchment paper, and pour in ice cream mixture.
Chill until ice cream texture, about 4-5 hours, or overnight.