To provide an enamel for microwave absorption which is used for a microwave-absorbing earthenware containing a lithium-iron-based complex oxide, and in the solidified layer of which applied to the microwave absorbing earthenware, no crack is generated when it is baked, and a microwave-absorbing earthenware of which the solidified enamel layer has no crack and accordingly which has no water leak.

The microwave-absorbing earthenware is manufactured, by using a potter's clay formed by kneading 10 wt.% of magnetite containing an iron compound containing a rare earth element and 10 wt.% of petalite containing a lithium oxide with 80 wt.% of gairome clay; compacting/drying/biscuit-firing it; then applying the enamel for the microwave-absorbing earthenware having a composition of 70 wt.% of petalite, 20 wt.% of kaolin, 5 wt.% of lime stone and 5 wt.% of zinc oxide, to the biscuit-fired half-finished product, and finally firing it at a temperature of 1,200-1,300C.