Patent ID: 8451546

Claim:
An image pickup device comprising: an image pickup element for converting an optical signal corresponding to an object into an image signal and outputting the image signal, the image pickup element having a pixel pitch of 1.4 to 1.75 μm and a pixel count of 5 to 8 mega pixels; and an image pickup lens for forming an image of the object on an image surface of the image pickup element, wherein the image pickup lens comprises, in order from the object side to the image surface side: a first lens having positive power; a second lens that is a meniscus lens having negative power and whose lens surface facing the image surface side is concave; a third lens that is a meniscus lens having positive power and whose lens surface facing the image surface side is convex; and a fourth lens that has negative power, whose lens surfaces are both aspherical and whose lens surface facing the image surface side is concave near an optical axis, and a diffractive optical element is formed on one of the lens surfaces of the first lens or the second lens.