To provide an objective lens capable of reducing an effective value of spherical aberration for an optical recording medium, and forming a beam spot having a small diameter on a recording plane of the optical recording medium.

In the optical head apparatus 1 using the objective lens 3 having a refraction plane 30 provided with a center region 33 and a peripheral region 34, when distance from a optical axis L in a direction being orthogonal to the optical axis L to an outer peripheral part 33c of the center region 33 is assumed to R, zero regions a1, a2 in which spherical aberration for an optical recording medium 4 becomes zero and/or a increasing/decreasing region a3 in which spherical aberration for the optical recording medium 4 is increased and decreased for zero exist in a range of R/3 to 2R/3 from the optical axis.