A flavor stick comprises: a flavor rod that is inserted into a heating chamber of a flavor inhaler device and is heated from the outer periphery thereof by an external heater disposed in the side periphery of the heating chamber; and a mouthpiece part connected to the rear end of the flavor rod. The flavor rod comprises a plurality of tightly wound rods and an outer winding paper that is wound around the plurality of tightly wound rods bundled together. Each of the plurality of tightly wound rods comprise an inner winding paper, and a flavor source and an aerosol-generating substrate that are disposed on the inner side of the inner winding paper.