Imaging lens system and imaging device

An imaging lens system comprising, in order from an object side:

• a front group including a first lens, and a second lens;
• an aperture stop;
• and
• a rear group including a third lens, a fourth lens, a fifth lens a sixth lens and a seventh lens and having a positive combined power, wherein
• an image side of the first lens has a concave surface facing an image side of the imaging lens system,
• a combined power of the first lens and the second lens is negative,
• the third lens has a positive power,
• an object side of the first lens has an aspherical surface,
• an incident-side surface of the first lens, which is on the object side, has an inflection point,
• the second lens has a negative power, and
• the imaging lens system satisfies
• 0.31≤L1H/L1R≤0.65, where
• L1H is a distance from an optical axis to the inflection point in a direction perpendicular to the optical axis of the first lens, and
• L1R is an effective radius of the incident-side surface of the first lens.