An object of the present invention is to provide a microwave operation device which reliably and easily enables coagulation and the like on the surface of a biological tissue, and allows sufficient coagulation and the like in the vicinity of the end of the microwave operation device when the microwave operation device is inserted into the biological tissue to coagulate its deep portion and do the like.The present invention provides a bipolar needle type microwave operation device, wherein at least one pair of rod-like electrodes are parallel to a center axis of the electrodes in their entirety, an insulator being filled between the paired electrodes. Preferably, at least two pairs of electrodes are alternate so that the electrodes having the same polarity are not adjacent to each other, and the ends of the paired electrodes having the same polarity are bridged with the same material as the electrodes. Preferably, a perpendicular distance between each of the electrodes and the center axis is within 2 mm.
