A device includes a sample rack having a mounting region for mounting a sample plate that holds a sample, a housing in which a temperature adjustment space for adjusting a temperature of the sample plate mounted on the sample rack while accommodating the sample rack inside is provided therein, and the housing having, in a lateral surface, a rack insertion opening through which the sample rack is inserted into the temperature adjustment space; and an air temperature adjustment part having an air intake port for taking in air in the temperature adjustment space, a temperature adjustment element for cooling or heating air taken in from the air intake portion, and an outlet for blowing out air cooled or heated by the temperature adjustment element.