An automatic analyzing apparatus 10 includes a chip rack 11 that stores a pipette chip, a pipette 12 into which a specimen is injected, a conveyance unit that conveys the pipette 12 by parallel translation, a reagent rack 14, a reaction unit 15, a detection unit 16, and a detection block unit 17. The pipette chip stored by the chip rack 11 has a planar structure to directly and optically detect the specimen. The chip rack 11 includes, in a hole that receives the pipette chip, a guide corresponding to the structure of the pipette chip. The pipette 12 sucks or discharges the specimen via the pipette chip mounted onto the tip thereof by a drive of a pump. In the detection unit 16, a measurement is carried out with the pipette chip arranged so that the plane that receives light is vertical to an optical axis.