The image pickup apparatus has an optical system having a plurality of lenses and an image pickup element arranged at an image position of the optical system, wherein the optical system is disposed such that a lens surface located closest to the object side and a lens surface closest to the image A first lens having a negative refractive power, a second lens having a positive refractive power, a third lens having a positive refractive power, a third lens having a positive refractive power, a third lens having a positive refractive power, And a fourth lens L 4. The object side surface of the second lens has a shape with a convex surface facing the object side and satisfies the following conditional expressions (1) and (2). max- min <4.0 10-5/ C (1) 1.8 < d / FL <6.5 (2)撮像装置は、複数のレンズを有する光学系と、光学系の像位置に配置された撮像素子と、を有し、光学系は、最も物体側に位置するレンズ面と、最も像側に位置するレンズ面と、を有すると共に、物体側から順に、負の屈折力を有する第1レンズL1と、正の屈折力を有する第2レンズL2と、正の屈折力を有する第3レンズL3と、第4レンズL4と、を有し、第2レンズの物体側面は、物体側に凸を向けた形状であり、以下の条件式(1)、(2)を満足する。 αmax-αmin<4.0×10-5/℃ (1) 1.8<Σd/FL<6.5 (2)
