A lens assembly comprising, no more than seven lenses (L1-L7) sequentially arranged along an optical axis direction from an object (obj) side to an image sensor side, wherein a first lens first disposed from the object (obj) side among the seven lenses (L1-L7) includes a convex object-side surface and a concave image sensor-side surface, and having a positive refractive power, wherein a second lens second disposed from the object (obj) side among the seven lenses (L1-L7) includes a convex object-side surface and a concave image sensor-side surface, and having a negative refractive power, wherein a third lens third disposed from the object (obj) side among the seven lenses (L1-L7) includes a convex object-side surface and a concave image sensor-side surface, and having a positive refractive power, wherein a fourth lens fourth disposed from the object (obj) side among the seven lenses (L1-L7) includes a concave object-side surface and a concave image sensor-side surface, and having a negative refractive power, wherein a fifth lens fifth disposed from the object (obj) side among the seven lenses (L1-L7) includes a convex object-side surface and a concave image sensor-side surface, and having a negative refractive power, wherein a sixth lens sixth disposed from the object (obj) side among the seven lenses (L1-L7) includes a convex object-side surface and a concave image sensor-side surface, and having a positive refractive power, wherein a seventh lens seventh disposed from the object (obj) side among the seven lenses (L1-L7) includes a convex object-side surface and a concave image sensor-side surface, and having a negative refractive power, and wherein the lens assembly meets Conditional equation 1, Conditional equation 2, and Conditional equation 5, 80 ≤ Vd 1 ≤ 90 f L − 1 f L ≤ − 1.5 1.8 ≤ Fno ≤ 1.85 wherein 'Vd1' is an Abbe's number of the first lens, 'f(L-1)' is a focal length of the second lens from the image sensor side, 'f ' is a focal length of the first lens from the image sensor side, and 'Fno' is an F number of the lens assembly. no more than seven lenses (L1-L7) sequentially arranged along an optical axis direction from an object (obj) side to an image sensor side, wherein a first lens first disposed from the object (obj) side among the seven lenses (L1-L7) includes a convex object-side surface and a concave image sensor-side surface, and having a positive refractive power, wherein a second lens second disposed from the object (obj) side among the seven lenses (L1-L7) includes a convex object-side surface and a concave image sensor-side surface, and having a negative refractive power, wherein a third lens third disposed from the object (obj) side among the seven lenses (L1-L7) includes a convex object-side surface and a concave image sensor-side surface, and having a positive refractive power, wherein a fourth lens fourth disposed from the object (obj) side among the seven lenses (L1-L7) includes a concave object-side surface and a concave image sensor-side surface, and having a negative refractive power, wherein a fifth lens fifth disposed from the object (obj) side among the seven lenses (L1-L7) includes a convex object-side surface and a concave image sensor-side surface, and having a negative refractive power, wherein a sixth lens sixth disposed from the object (obj) side among the seven lenses (L1-L7) includes a convex object-side surface and a concave image sensor-side surface, and having a positive refractive power, wherein a seventh lens seventh disposed from the object (obj) side among the seven lenses (L1-L7) includes a convex object-side surface and a concave image sensor-side surface, and having a negative refractive power, and wherein the lens assembly meets Conditional equation 1, Conditional equation 2, and Conditional equation 5, 80 ≤ Vd 1 ≤ 90 f L − 1 f L ≤ − 1.5 1.8 ≤ Fno ≤ 1.85 wherein 'Vd1' is an Abbe's number of the first lens, 'f(L-1)' is a focal length of the second lens from the image sensor side, 'f ' is a focal length of the first lens from the image sensor side, and 'Fno' is an F number of the lens assembly.