A light scanning apparatus, including: a first holding member configured to hold a first light emitting element configured to emit a first light beam; a second holding member configured to hold a second light emitting element configured to emit a second light beam; a rotary polygon mirror; a first mounting portion on which the first holding member is mounted; and a second mounting portion on which the second holding member is mounted, the second mounting portion being provided adjacent to the first mounting portion, wherein the first mounting portion has a V-shape including two limbs in a cross section, and wherein one limb of the two limbs on the side of the second mounting portion is shorter than other limb of the two limbs on a side opposite to the side of the second mounting portion.