Container for use in precooked foods

A container for use in heating precooked foods comprising a disposable container main body composed of incombustible paper for containing precooked foods and a disposable heater device composed of incombustible material such as incombustible paper or aluminum, having a solid fuel, integrally packaged together with said container main body and capable of heating said main body, said heater device having a bottom wall supporting said solid fuel, an upwardly extending side wall and an open top for receiving said container main body and slidable thereon, said heater device having a plurality of recesses extending vertically of said upwardly extending side wall, said vertical recesses being open at the top and each having a laterally extending groove, said main body having an outwardly extending protrusion engaged in each of said vertical recesses for movement in said vertical recesses when said main body is lifted relative to said heater device and for engagement in said lateral grooves when said lifted main body is rotated in a first direction relative to said heater device and for disengagement with said lateral grooves and re-engagement with said vertical recesses for lifting said main body out of said heater device and separating said main body from said heater device when the main body is rotated relative to said heater device in the reverse direction.