PROBLEM TO BE SOLVED: To provide a disposable body warmer retaining fitting property of the body warmer to a body curved surface and inhibiting temperature variation among heat generation parts.SOLUTION: The disposable body warmer includes: a plurality of heat generation parts including heat-generation powder generating heat by presence of air and a laminated structure including a plurality of heat generation parts disposed at intervals in the inside thereof, with air permeability for the plurality of heat generation parts secured. The laminates structure includes, in the inside thereof, at least one connection part that connects between at least two heat generation parts in the plurality of heat generation parts such that air flows therebetween.
