Imaging lens system, camera module, in-vehicle system, vehicle

An imaging lens system comprising, sequentially from an object side toward an image side:

• a front lens group comprising:
• a first lens, the first lens being a meniscus lens having negative power with an object-side surface whose convex surface faces the object side;
• a second lens, the second lens being a meniscus lens with the object-side surface whose concave surface faces the object side;
• and
• a third lens having positive power:
• an iris;
• and
• a rear lens group comprising:
• a fourth lens having positive power;
• a fifth lens and a sixth lens constituting a cemented lens;
• and
• a seventh lens, wherein the imaging lens system satisfies a following Expression (1):
• 2.0<Frg/F<3.0 (1)
• where Frg is a composite focal length of the rear lens group and F is a focal length of an entire optical system, wherein
• the third lens is a biconvex lens,
• the fourth lens is a biconvex lens,
• a convex surface of an object-side surface of the fifth lens faces the object side, and
• a concave surface of an image-side surface of the sixth lens faces the image side.