To provide a method of mixing an oil component in a material to be heated in advance, or a method of uniformly heating by suppressing carbonization without necessitating a method of repeating peeling a heating completed part on a lower side and applying oil, thereby achieving both a low cholesterol processing due to a reduction of an oil component and a soft cooking degree in the case where a material to be heated is a food product.SOLUTION: An oil applicator (2) and a convector (1) are provided, and an oil is applied on a heating vessel. After start of heating, the convector (1) is moved on the heating vessel to make a matter to be heated in the above layer convect with only one layer that contacts with the heating vessel remained. Furthermore, these are fixed to the heating vessel with a fixture (7).SELECTED DRAWING: Figure 1【課題】 加熱対象物に予め油分を混ぜる方法や、下層の加熱完了部分を剥がして再度油を塗布することを何度も繰り返す方法を必要とせず、炭化を抑えて均一に加熱する方法を提供する。加熱対象物が食品の場合は、油分の減少により低コレストロール加工化とふわふわの調理加減を両立を提供する。【解決手段】 油塗布器（２）と対流器（１）を設け、加熱容器に油を塗布する。加熱開始後、対流器（１）を加熱容器上で動かし、加熱容器に接触している一層のみを残してそれより上層の加熱対象物を対流させる。また、これらを固定具（７）で加熱容器に固定する。【選択図】図１
