A bolometric humidity sensor, cooker having the same applied thereto, and method for controlling the cooker are provided. The bolometric humidity sensor has two static bolometric temperature sensors for detecting humidity more accurately. A cooker may have such a bolometric humidity sensor fitted to one side of a bracket on an air outlet for deflecting air flowing out of the cooker. This arrangement allows for more accurate detection of the humidity in the cooking chamber. A method of controlling a cooker could include the use of such a sensor to permit a cooking time period to differ depending on whether the cooked food is wrapped.