A polarized image acquisition apparatus includes a rotatable diaphragm to restrict a passage region of light passed through an objective lens to two regions mutually opposite across the central axis in 4n equal regions divided rotationally symmetrically in the plane orthogonal to the traveling direction of the light passed through the objective lens, and to change the angle of the passage region so that each two regions of the 4n equal regions become passage regions in order; and a rotating half-wave plate to convert, for each angle of the passage region, a P-polarized component passed through the diaphragm, in the same direction as the angle of the passage region, and an S-polarized component passed through the diaphragm, orthogonal to the angle of the passage region, into polarized waves in orthogonal first and second directions.
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