An imaging element of a vein imaging apparatus according to the invention includes a vein image data generation region for generating image data of a vein based on a near-infrared light that was condensed by a lens array and that was scattered in the living body and transmitted through the vein, and a thermal noise output data generation region that includes a pixel shielded from light and generates a thermal noise output that is an output value output from the pixel shielded from light. The vein imaging apparatus according to the present invention measures thermal noise based on the thermal noise output data, and estimates an imaging temperature based on a measurement result of this thermal noise. The vein imaging apparatus according to the present invention performs interpolation processing of the image based on the estimated temperature during imaging process.
