To dispense a sample to a reaction container by hands, to load a reagent for reacting and generating stable radical species, and to efficiently measuring the electronic spin resonance of the radical species.

In a reaction table 2 being fitted to the center of a device body, a plurality of reaction containers are arranged on inside and outside support boards in a plurality of rows, the inside and outside support boards are rotated by separate servo motors, and at the same time, a vibration board for vibrating the reaction container is fitted onto the lower surface of the inside support board. Around the reaction table, a first reagent table 23 where a sample and a reagent are fitted, a second reagent table 37, and dispensing unit 50 are provided.