The purpose of the invention is to provide a microwave surgical tool of reduced size that is capable of making surgical work more convenient. This microwave surgical tool (1) is provided with: a main surgical tool body (21) having an electrode (24) for irradiating microwaves on living tissue； a microwave generator (51) for generating the microwaves that is built into the main surgical tool body (21)； and an amplifier (52), built into the main surgical tool body (21) and connected between the electrode (24) and microwave generator (51), for amplifying the microwaves from the microwave generator and transmitting same to the electrode (24).
