According to one aspect of the present invention, a device for acquiring polarized image comprises: a rotatable diaphragm for changing the angle of a passing area such that the passing area of a light passing through an object lens is gathered in two regions opposite to each other across a central axis among 4n regions divided by 4n in a rotational symmetry within a surface orthogonal to a proceeding direction of the light passing through the object lens, while 2 regions of the 4n regions are sequentially become the passing area; and a rotatable half-wave plate converting a P-polarized light component in a same direction and an S-polarized light component in an orthogonal direction with respect to the angle of the passing region passing through the diaphragm into predetermined deflection waves in first and second orthogonal directions.
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