A steam-generating warming device 1 includes a holder 22 having a first surface 23 adapted to face the skin of a wearer and an opposite second surface 24 adapted to face outward and a moist heat generating member 21 held in the holder 22. The moist heat generating member 21 is designed to generate heat as a result of oxidation of an oxidizable metal, generate steam by making use of the heat, and release the steam through the first surface 23. The steam-generating warming device further includes a water-impregnated, water-retaining sheet 6 adjoining the moist heating member 21. The water-retaining sheet 6 is preferably disposed between the moist heat generating member 21 and the second surface 24.
