There is provided an automatic analyzer including: a sample pipetting mechanism 7, reagent pipetting mechanisms 12A and 12B, mixing mechanisms 33A and 33B, a scattered light photometer 40, and an absorption photometer 41 all located on a transfer path of reaction cells 2 arranged circumferentially on a disk-shaped reaction disk 1, the reaction cells 2 being transferred in the circumferential direction by rotation of the reaction disk 1. Scattered light intensity and absorbance are controlled to be measured by causing the reaction cells 2 to move past a scattered light detection position and a transmitted light detection position in the same process of movement, the two positions being established beforehand on the transfer path. This makes it possible to suppress the effects on measurement results of the difference in time between scattered light measurement and absorbance measurement thereby improving measurement accuracy.