An image pickup device including an imaging lens, an image sensor, and a multiple aperture optical element is provided. The multiple aperture optical element is disposed on a light path between the imaging lens and the image sensor, and includes aperture elements arranged in an array. A ratio of an image side f-number of the imaging lens to an object side f-number of the imaging lens is within a range of 0.25 to 2. A light field image pickup lens is also provided.