Abstract: A reaction device including a microwave oscillation means for generating microwaves; holding containers for individually holding multiple samples collected from collection targets (e.g., human targets, etc.); a microwave irradiation container on which each of the holding containers can be individually loaded; a temperature sensor for detecting the temperature of a sample held in a holding container or of the interior of the microwave irradiation container; and a microwave control means for varying the microwaves generated by the microwave oscillation means on the basis of the temperature detected by the temperature sensor. The microwave irradiation container includes: a microwave introduction port for introducing the microwaves generated by the microwave oscillation means into the microwave irradiation container; and ring-shaped patterns for irradiating each of the holding containers with the microwaves introduced from the microwave introduction port.