Measurement device

A measurement device that irradiates a measurement target object with distance measurement light and measures a distance to the measurement target object based on reflected distance measurement light that is the distance measurement light reflected on the measurement target object and internal reference light, the measurement device comprising:

• a light source that emits the distance measurement light;
• a focusing member that transmits the reflected distance measurement light and reflects reflected collimated light to form an image of the measurement target object, the reflected collimated light being reflected by the measurement target object and in a wavelength band different from a wavelength band of the reflected distance measurement light;
• a distance measurement light reception unit that receives the reflected distance measurement light that has been transmitted through the focusing member and the internal reference light;
• a collimated light reception unit that receives the reflected collimated light reflected by the focusing member;
• a reflection mirror that is disposed on an optical path between the focusing member and the collimated light reception unit, disposed on an optical axis on which the focusing member is also disposed, and reflects the reflected collimated light that has been reflected by the focusing member, toward the collimated light reception unit;
• and
• an objective lens that is disposed on the optical axis, wherein
• the focusing member is a plate shaped member that does not condense the reflected distance measurement light,
• the focusing member transmits the reflected distance measurement light and causes the distance measurement light reception unit to receive the reflected distance measurement light, the reflected distance measurement light being reflected by the measurement target object and condensed by the objective lens, and
• the focusing member reflects the reflected collimated light and causes the reflection mirror to further reflect the reflected collimated light and causes the collimated light reception unit to receive the reflected collimated light, the reflected collimated light being reflected by the measurement target object and condensed by the objective lens.