An in-vehicle camera lens, the in-vehicle camera lens sequentially consisting essentially of, from an object side to an image side thereof: a first lens (L1) with a negative refractive power, whose object side surface (S1) is convex and image side surface (S2) is concave; a second lens (L2) with a negative refractive power, whose object side surface (S3) is concave and image side surface (S4) is convex; a third lens (L3) with a positive refractive power, whose object side surface (S5) and image side surface (S6) are both convex; a stop (S7); a fourth lens (L4) with a positive refractive power, whose object side surface (S8) and image side surface (S9) are both convex; a fifth lens (L5) with a negative refractive power, whose object side surface (S10) is concave surface; wherein the fifth lens and the fourth lens constitute a bonding lens group; a sixth lens (L6) with a positive refractive power, whose object side surface (S12) is convex; and a filter (G1); wherein the second lens (L2), the third lens (L3), the fourth lens (L4), and the fifth lens (L5) are glass spherical lenses; and the first lens (L1) and the sixth lens (L6) are both glass aspherical lenses; wherein the in-vehicle camera lens satisfies the following expressions: − 1.5 < R 21 / f < − 0.8 ; R 41 / f < 1.8 ; f / R 52 < 0.2 ; where R 21 represents a curvature radius of the object side surface (S3) of the second lens (L2); R 41 represents a curvature radius of the object side surface (S8) of the fourth lens (L4); R 52 represents a curvature radius of the image side surface (S11) of the fifth lens (L5); and f represents a focal length of the in-vehicle camera lens; wherein the in-vehicle camera lens satisfies the following expressions: dn / dt 4 < − 5 × 10 − 6 / ° C ; f 4 / f < 1.5 ; where (dn/dt)4 represents a temperature coefficient of refractive index of the fourth lens (L4); and f 4 represents a focal length of the fourth lens (L4). a first lens (L1) with a negative refractive power, whose object side surface (S1) is convex and image side surface (S2) is concave; a second lens (L2) with a negative refractive power, whose object side surface (S3) is concave and image side surface (S4) is convex; a third lens (L3) with a positive refractive power, whose object side surface (S5) and image side surface (S6) are both convex; a stop (S7); a fourth lens (L4) with a positive refractive power, whose object side surface (S8) and image side surface (S9) are both convex; a fifth lens (L5) with a negative refractive power, whose object side surface (S10) is concave surface; wherein the fifth lens and the fourth lens constitute a bonding lens group; a sixth lens (L6) with a positive refractive power, whose object side surface (S12) is convex; and a filter (G1); wherein the second lens (L2), the third lens (L3), the fourth lens (L4), and the fifth lens (L5) are glass spherical lenses; and the first lens (L1) and the sixth lens (L6) are both glass aspherical lenses; wherein the in-vehicle camera lens satisfies the following expressions: − 1.5 < R 21 / f < − 0.8 ; R 41 / f < 1.8 ; f / R 52 < 0.2 ; where R 21 represents a curvature radius of the object side surface (S3) of the second lens (L2); R 41 represents a curvature radius of the object side surface (S8) of the fourth lens (L4); R 52 represents a curvature radius of the image side surface (S11) of the fifth lens (L5); and f represents a focal length of the in-vehicle camera lens; wherein the in-vehicle camera lens satisfies the following expressions: dn / dt 4 < − 5 × 10 − 6 / ° C ; f 4 / f < 1.5 ; where (dn/dt)4 represents a temperature coefficient of refractive index of the fourth lens (L4); and f 4 represents a focal length of the fourth lens (L4). <EOS>