Breath diagnostic equipment

Breath diagnosis apparatus according to the embodiment includes a cell portion, a light source unit, a detection unit, and a control unit. Cell portion includes a first space sample gas containing a second material is introduced. Light source unit causes the light to enter the space. Detector detects the intensity of light passing through the space in which the sample gas is introduced. Control unit, during the first operation, the light source unit, the wavelength of light, the first wavelength of the first peak of the light absorption of the first material, and a second wavelength of the second peak of the optical absorption of the second material, varied within a wavelength band including, on the basis of the result detected by the detection unit, it calculates the ratio of the amount of a substance contained in the sample gas. Control unit, during the second operation, the light source unit, the wavelength of light is the third wavelength, on the basis of the result detected by the detection unit detects a temporal change in the amount of material.