Measurement apparatus and measurement method

A measurement method in a measurement apparatus including

• a light source that emits light,
• a spectroscopic element that is configured to transmit light of a predetermined wavelength out of the light emitted from the light source portion, and capable of changing the predetermined wavelength of the light to be transmitted within a predetermined wavelength range,
• an interference optical system which separates light emitted from the spectroscopic element into measurement light irradiated on a measurement target and reference light reflected by a reference body, and generates interference light obtained by combining the measurement light reflected by the measurement target and the reference light reflected by the reference body, and
• an image sensor that receives the interference light, the measurement method comprising:
• acquiring spectrum information indicating a change in a received light quantity at the light receiving portion when the predetermined wavelength of the light transmitted through the spectroscopic element is changed;
• and
• calculating a position of the measurement target based on the spectrum information.