A lens support structure includes a third lens 53, a fourth lens 54, a first frame 50, and an adhesive agent 58. The first frame 50 has a first portion 55 to which the third lens 53 is fitted and a second portion 56 where the second lens element is disposed inside the inner periphery thereof. The adhesive agent 58 fixes the fourth lens 54 to the first frame 50. The material of the fourth lens 54 has lower stiffness than the material of the third lens 53, or has a larger coefficient of linear expansion. A gap S is formed in the radial direction between the fourth lens 54 and the second portion 56. The inside diameter of the first portion 55 is different from the inside diameter of the second portion 56.