1. An image pickup device, comprising: a plurality of photoelectric conversion units arranged two-dimensionally; a plurality of interlayer lenses, each having a shape convexed toward incident light directly above a respective one of the plurality of photoelectric conversion units, wherein a surface opposite to the convexed shape and facing the respective photoelectric conversion unit is flat: a plurality of color filters, each arranged on a respective one of the plurality of interlayer lenses and each filtering a color different from a color filtered by an adjacent color filter, wherein interfaces are formed between the adjacent color filters of different colors; a planarized film arranged on the plurality of color filters; and a plurality of microlenses arranged on the planarized film, each having a shape convexed toward incident light and aligned above a respective one of the plurality of the interlayer lenses, wherein each of the plurality of color filters has a bottom surface that matches the convexed shape of a corresponding one of the plurality of interlayer lenses, and a top surface that is substantially planarized, wherein regions between adjacent microlenses are positioned above the interfaces between the color filters, wherein a thickness of each of the plurality of color filters increases from a central portion thereof toward boundary portions with adjacent color filters, so that light incident from the regions between the microlenses decreases at the boundary portions including the interfaces between the color filters, and wherein a thickness at the boundary portions of the color filters is twice as thick as a thickness at the central portions of the color filters.