Patent ID: 8040507

Claim:
A spectrometer comprising: a body portion through which light is allowed to transmit; a spectroscopic portion that disperses a light made incident into the body portion from a side of a predetermined plane of the body portion, and reflects lights to the side of the predetermined plane; a light detecting element which is disposed on the predetermined plane, the light detecting element detects the lights dispersed by the spectroscopic portion; and a package which has a light incident portion through which a light advancing to the spectroscopic portion is made incident into the inside of the package, the package houses the spectroscopic portion and the light detecting element, wherein, the body portion has a first plane surface substantially perpendicular to the predetermined plane, a second plane surface substantially perpendicular to the predetermined plane and the first plane surface, and a curved surface which is provided with the spectroscopic portion, the curved surface intersects with the predetermined plane, the first plane surface, and the second plane surface, and the package has a first inner wall surface coming into planar-contact with the first plane surface, a second inner wall surface coming into planar-contact with the second plane surface, and contact portions coming into contact with the curved surface.