An optical imaging apparatus comprising: a polarizer assembly configured to acquire a first light ray of a first polarization component and a second light ray of a second polarization component which is different from the first polarization component, by using a light flux from an identical direction; a polarization image sensor located in a position facing the polarizer assembly, and configured to acquire an image of the first polarization component and an image of the second polarization component at once or at the same time; and a lens assembly including a first lens configured to form the images on the polarization image sensor, wherein the polarizer assembly includes: a first polarizing optical element configured to acquire the first light ray of the first polarization component; and a second polarizing optical element configured to acquire the second light ray of the second polarization component, and the first polarizing optical element and the second polarizing optical element neighbor each other, and wherein the second polarizing optical element is disposed inside the first polarizing optical element, the first polarizing optical element and the second polarizing optical element are concentric, characterized in that the polarizer assembly is located between the first lens and the polarization image sensor and is located in a focal plane of the first lens. a polarizer assembly configured to acquire a first light ray of a first polarization component and a second light ray of a second polarization component which is different from the first polarization component, by using a light flux from an identical direction; a polarization image sensor located in a position facing the polarizer assembly, and configured to acquire an image of the first polarization component and an image of the second polarization component at once or at the same time; and a lens assembly including a first lens configured to form the images on the polarization image sensor, wherein the polarizer assembly includes: a first polarizing optical element configured to acquire the first light ray of the first polarization component; and a second polarizing optical element configured to acquire the second light ray of the second polarization component, and the first polarizing optical element and the second polarizing optical element neighbor each other, and wherein the second polarizing optical element is disposed inside the first polarizing optical element, the first polarizing optical element and the second polarizing optical element are concentric, characterized in that the polarizer assembly is located between the first lens and the polarization image sensor and is located in a focal plane of the first lens. a first polarizing optical element configured to acquire the first light ray of the first polarization component; and a second polarizing optical element configured to acquire the second light ray of the second polarization component, and the first polarizing optical element and the second polarizing optical element neighbor each other, and wherein the second polarizing optical element is disposed inside the first polarizing optical element, the first polarizing optical element and the second polarizing optical element are concentric, characterized in that the polarizer assembly is located between the first lens and the polarization image sensor and is located in a focal plane of the first lens.