An imaging lens assembly comprising eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8), the eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8) being, in order from an object side to an image side along an optical path, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element and an eighth lens element, and each of the eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8) having an object-side surface facing toward the object side and an image-side surface facing toward the image side; wherein a total number of lens elements of the imaging lens assembly is eight, the first lens element has positive refractive power, the object-side surface of the first lens element is convex in a paraxial region thereof, the image-side surface of the first lens element is concave in a paraxial region thereof, the object-side surface of the second lens element is convex in a paraxial region thereof, the image-side surface of the second lens element is concave in a paraxial region thereof, the fifth lens element has positive refractive power, the sixth lens element has negative refractive power, the image-side surface of the sixth lens element is concave in a paraxial region thereof, the seventh lens element has positive refractive power, the object-side surface of the seventh lens element is convex in a paraxial region thereof, the eighth lens element has negative refractive power, and at least one of the object-side surface and the image-side surface of at least one lens element of the imaging lens assembly has at least one critical point in an off-axis region thereof; wherein an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, an Abbe number of the third lens element is V3, an Abbe number of the fourth lens element is V4, an Abbe number of the fifth lens element is V5, a curvature radius of the image-side surface of the sixth lens element is R12, a curvature radius of the object-side surface of the seventh lens element is R13, a focal length of the first lens element is f1, a focal length of the fifth lens element is f5, a focal length of the sixth lens element is f6, a focal length of the seventh lens element is f7, a focal length of the eighth lens element is f8, a central thickness of the first lens element is CT1, a central thickness of the fifth lens element is CT5, an axial distance between the first lens element and the second lens element is T12, an axial distance between the fourth lens element and the fifth lens element is T45, a focal length of the imaging lens assembly is f, an axial distance between the object-side surface of the first lens element and an image surface is TL, an entrance pupil diameter of the imaging lens assembly is EPD, a maximum image height of the imaging lens assembly is ImgH, and the following conditions are satisfied: 2.0 < V 1 + V 3 + V 5 / V 2 + V 4 < 9.0; 0.60 < R 12 / R 13 < 3.3; 0.20 < f 5 / f 1 < 4.0; 0.10 < f 6 / f 8 < 4.5; − 1.7 < f 7 / f 8 < − 0.20; 25.0 < CT 1 / T 12 + CT 5 / T 45; and 1.2 < f × TL / EPD × ImgH < 2.2. wherein a total number of lens elements of the imaging lens assembly is eight, the first lens element has positive refractive power, the object-side surface of the first lens element is convex in a paraxial region thereof, the image-side surface of the first lens element is concave in a paraxial region thereof, the object-side surface of the second lens element is convex in a paraxial region thereof, the image-side surface of the second lens element is concave in a paraxial region thereof, the fifth lens element has positive refractive power, the sixth lens element has negative refractive power, the image-side surface of the sixth lens element is concave in a paraxial region thereof, the seventh lens element has positive refractive power, the object-side surface of the seventh lens element is convex in a paraxial region thereof, the eighth lens element has negative refractive power, and at least one of the object-side surface and the image-side surface of at least one lens element of the imaging lens assembly has at least one critical point in an off-axis region thereof; wherein an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, an Abbe number of the third lens element is V3, an Abbe number of the fourth lens element is V4, an Abbe number of the fifth lens element is V5, a curvature radius of the image-side surface of the sixth lens element is R12, a curvature radius of the object-side surface of the seventh lens element is R13, a focal length of the first lens element is f1, a focal length of the fifth lens element is f5, a focal length of the sixth lens element is f6, a focal length of the seventh lens element is f7, a focal length of the eighth lens element is f8, a central thickness of the first lens element is CT1, a central thickness of the fifth lens element is CT5, an axial distance between the first lens element and the second lens element is T12, an axial distance between the fourth lens element and the fifth lens element is T45, a focal length of the imaging lens assembly is f, an axial distance between the object-side surface of the first lens element and an image surface is TL, an entrance pupil diameter of the imaging lens assembly is EPD, a maximum image height of the imaging lens assembly is ImgH, and the following conditions are satisfied: 2.0 < V 1 + V 3 + V 5 / V 2 + V 4 < 9.0; 0.60 < R 12 / R 13 < 3.3; 0.20 < f 5 / f 1 < 4.0; 0.10 < f 6 / f 8 < 4.5; − 1.7 < f 7 / f 8 < − 0.20; 25.0 < CT 1 / T 12 + CT 5 / T 45; and 1.2 < f × TL / EPD × ImgH < 2.2.