A lens assembly includes a lens including an optical portion refracting light and a flange portion extending along a portion of a circumference of the optical portion, a blocking member disposed in front of the lens and having an opening to allow light to be incident on the lens, and a lens barrel accommodating the lens. The optical portion is noncircular and a portion of the blocking member facing the optical portion in an optical axis direction is located to be higher than a portion of the blocking member facing the flange portion in the optical axis direction.