A spectroscopic apparatus (10, 20, 30, 40, 50, 60, 70, 80, 90, 100) using light having a first wavelength which has a predetermined absorptivity for a specific object, and light having a second wavelength which has a smaller absorptivity for the specific object than the first wavelength, the spectroscopic apparatus comprising: a light radiating portion configured to radiate, to a target, collimated light with the first wavelength which is obtained by the light having the first wavelength being substantially collimated, and collimated light with the second wavelength which is obtained by the light having the second wavelength being substantially collimated; a light receiving portion configured to receive first scattered light obtained by the collimated light with the first wavelength transmitting through the target or being reflected by the target, and second scattered light obtained by the collimated light with the second wavelength transmitting through the target or being reflected by the target; and a measuring portion configured to determine whether or not the specific object is present at the target, based on a ratio between an intensity of the first scattered light and an intensity of the second scattered light received by the light receiving portion, wherein the light radiating portion includes a scan processing portion configured to radiate the collimated light with the first wavelength and then radiate the collimated light with the second wavelength to the target so as to scan in 2-dimensional directions directly through reflection, and the measuring portion stores the first scattered light received by the light receiving portion and a scanning angle controlled in the 2-dimensional-direction scanning of the collimated light with the first wavelength by the scan processing portion, so as to be 2-dimensionally associated with each other, stores the second scattered light received by the light receiving portion and a scanning angle controlled in the 2-dimensional-direction scanning of the collimated light with the second wavelength by the scan processing portion, so as to be 2-dimensionally associated with each other, and calculates the ratio between the intensity of the first scattered light and the intensity of the second scattered light for each scanning angle. a light radiating portion configured to radiate, to a target, collimated light with the first wavelength which is obtained by the light having the first wavelength being substantially collimated, and collimated light with the second wavelength which is obtained by the light having the second wavelength being substantially collimated; a light receiving portion configured to receive first scattered light obtained by the collimated light with the first wavelength transmitting through the target or being reflected by the target, and second scattered light obtained by the collimated light with the second wavelength transmitting through the target or being reflected by the target; and a measuring portion configured to determine whether or not the specific object is present at the target, based on a ratio between an intensity of the first scattered light and an intensity of the second scattered light received by the light receiving portion, wherein the light radiating portion includes a scan processing portion configured to radiate the collimated light with the first wavelength and then radiate the collimated light with the second wavelength to the target so as to scan in 2-dimensional directions directly through reflection, and the measuring portion stores the first scattered light received by the light receiving portion and a scanning angle controlled in the 2-dimensional-direction scanning of the collimated light with the first wavelength by the scan processing portion, so as to be 2-dimensionally associated with each other, stores the second scattered light received by the light receiving portion and a scanning angle controlled in the 2-dimensional-direction scanning of the collimated light with the second wavelength by the scan processing portion, so as to be 2-dimensionally associated with each other, and calculates the ratio between the intensity of the first scattered light and the intensity of the second scattered light for each scanning angle.