To provide an imaging device and an information code reader in which an optical system can be simplified, the cost can be reduced, fluctuation of a resin lens can be suppressed, and deterioration in lens performance due to expansion can be suppressed.

The optical system 210 includes a first lens 211, a second lens 212, a diaphragm 213, a third lens 214 and a fourth lens 215. The first lens 211, the third lens 214 and the fourth lens 215 are made of glass. A lens holding portion 300 holds only the area of a part of the peripheral portion 212a of the resin lens (the second lens 212 in the embodiment).