Zoom lens and image pickup unit

An image pickup unit with a zoom lens and an image pickup device outputting an image pickup signal based on an optical image formed by the zoom lens, the zoom lens comprising:

• a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, and a fourth lens group having positive refractive power, the first to fourth lens groups being arranged in order from an object side,
• wherein zooming is performed through varying a distance between adjacent lens groups of the first to fourth lens groups, and
• the fourth lens group includes a first positive lens, a first negative meniscus lens, and a cemented lens which are arranged in order from the object side, the cemented lens being configured of a second negative meniscus lens with a convex surface facing the object side and a second positive lens.