There is provided a light scanning apparatus that is free from main scanning jitter and allows size reduction of a deflector. The light scanning apparatus has a plurality of light sources, a deflector that deflects a plurality of light fluxes emitted from a plurality of light sources to scan a plurality of scanned surfaces along a main scanning direction, and a first stop arranged between the plurality of light sources and the deflector and provided with an aperture that regulates the width of the plurality of light fluxes with respect to the main scanning direction. The number of apertures of the first stop is smaller than the number of light sources.