Provided are an inkjet ink prepared by dissolving or dispersing a specific dye in an aqueous medium and containing one of at least one alkylene diol where one alkylene group has at least 3 carbon atoms or homologue thereof and at least one polymer compound; and an ink set containing an ink including a specific dye and an ink including one compound capable of interacting with the dye; thereby being able to provide an ink and the like having a good jet-out stability, and forming images of good quality with neither beading nor bronzing, and the images formed of the inks have good fastness to heat, light and ozone.