An automatic analysis apparatus and an automatic analysis method that can perform both spectrophometric measurements for biochemical tests and the turbidimetric immunoassay with high precision by selectively exchanging a white light or at least one monochromatic light based on analysis conditions determined by a measure condition setting unit for respective measuring object. The automatic analysis apparatus includes an irradiating direction setting unit configured to irradiate the selected white light or at least one monochromatic light based on the analysis conditions onto a reaction cuvette along the same light axis and a light detection unit having a plurality of light receiving elements in order to detect the white light of particular determined wavelength lights and the selected monochromatic light.