HAIR CUTTING MEMBER AND HAIR CUTTING DEVICE

A microwave treatment device comprises: a heating chamber that accommodates a heating target, a microwave generator that generates a microwave; a feeding unit that supplies the microwave to the heating chamber; a reflected microwave power detector that detects a reflected microwave power retuned to the microwave generator; a controller that controls the microwave generator; and a storage unit. The storage unit stores a level of the reflected microwave power detected by the reflected microwave power detector together with a frequency of the microwave supplied to the heating chamber and an elapsed time after a start of heating the heating target. The controller causes the microwave generator to execute a frequency sweep over a specified frequency band and determines that the heating target is in a boiling state based on a temporal change in a value that is obtained based on the reflected microwave power at each frequency.