A fryer in which an overshoot is prevented by an accurate oil temperature control is disclosed. A pulse burner (4) is controlled to be switched ON/OFF based on a condition which is different by each temperature range. This enables to control the pulse burner (4) in accordance with factors which effect on the oil temperature such as an amount and heat capacity of foods and heat quantity of a utensil. Whereby, the oil temperature control in an excellent level is performed under various conditions. Moreover, as the condition to perform ON/OFF control of the pulse burner (4) is simple, for example, which is whether or not the temperature gradient of cooking oil exceeds the standard value, it needs no complicated control and reliability is improved.