A cooking utensil having five layer members which includes a first diaphragm member and a second diaphragm member, at least one thermostat set wherein said at least one thermostat set is situated within first layer, at least one heat sensor, wherein said at least one sensor comprises of a liquid which is sensitive to heat, a thermal induction actuator (81), which selectively closes said first diaphragm member and second diaphragm member according to temperature of the outer member of bottom of intermediate member. A hot air passage formed vertically in a part of the circumference between the sidewalls of the outer member and outer member of third layer, which causes the passage of hot air, a cool air passage formed vertically in a part of circumference between the sidewalls of outer member and inner member of second outer member which causes entering of cool air. Heat energy transmitted from the bottom of outer member will be diverted from the intermediate member and guided to outside of the cooking utensil by being spread out throughout the sidewalls of the cooking utensil. Therefore, the food in inner member which is closely contacted with the intermediate member is not scorched or burned.