A spectrophotometer (40) includes a sample placement unit (422) in which a sample to be analyzed is placed, a light source unit (411, 412) including a plurality of light sources that irradiates the sample placed in the sample placement unit (422) with light, a detection unit (425) that detects light emitted from the sample (422), a housing (41, 42) that accommodates the sample placement unit (422), the light source unit (411, 412), and the detection unit (425), a storage unit (71) in which information of a temperature value predetermined for each combination of one or a plurality of light sources among the plurality of light sources is stored, a light source designation accepting unit (721) that accepts designation related to a combination of one or a plurality of light sources among the plurality of light sources, a target temperature setting unit (722) that reads a temperature value corresponding to the combination of light sources accepted by the light source designation accepting unit from the storage unit and sets the temperature to the target temperature, and a temperature adjusting unit (416, 417, 426, 427, 723) that maintains a temperature inside the housing at a target temperature.