A scanning optical system includes a deflector for deflecting a laser light flux from a light source and a second imaging optical system for focusing the laser light flux deflected by the deflector on a target scanning surface. The second imaging optical system has at least one optical function surface on which an optical function portion including a plurality of convex portions arranged therein so as to have a serrate cross section is formed in at least part thereof. The optical function surface is formed so that a width of each of the convex portions in an arrangement direction in which the convex portions are arranged is larger than a width of the laser light flux in the arrangement direction, which enters the optical function surface.

 
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