Heating body and method for producing the same

A heating body in which a heat-generating composition that generates heat by reacting with air is accommodated in a bag body formed by heat sealing a one-surface side laminated base material comprising a first base material and a second base material, and a covering material, at a peripheral edge portion thereof, characterized in that:

• the first base material has one surface being a nonwoven fabric layer and an other surface being a heat sealable resin layer;
• the second base material is a sheet in which an olefin-based nonwoven fabric layer and a resin film are laminated using an olefin-based resin that forms a laminate layer between the olefin-based nonwoven fabric layer and the resin film;
• the first base material and the second base material are capable of forming a space into which a body part can be inserted or held, in a part surrounded by the peripheral edge portion;
• and
• in a heat sealed part of the bag body peripheral edge portion, the heat sealable resin layer of the first base material and the nonwoven fabric layer of the second base material are bonded together, and the resin film of the second base material and the covering material are bonded together.