A plurality of light sources, an optical deflector including a rotational member configured to be rotational about an axis of rotation thereof, and a plurality of reflective members, are provided in a light scanning unit for an image forming apparatus. The optical deflector is arranged to deflect light incident obliquely from the plurality of light sources and the plurality of reflective members are arranged to reflect the light deflected by the optical deflector to a plurality of surfaces, which are to be scanned and correspond to the plurality of light sources, and arranged such that scan lines on opposite surfaces with respect to the axis of rotation of the optical deflector among the plurality of surfaces to be scanned are bent in the same direction.