An ink used in an ink jet recording method in which ink droplets are ejected from a recording head by the action of thermal energy to record an image on a recording medium; the ink being characterized by containing (a) a pigment, (b) a dispersing agent, (c) a liquid medium, (d) a polyglycerol and (e) at least one selected from a potassium salt of a carboxylic acid, a rubidium salt of a carboxylic acid and a cesium salt of a carboxylic acid.