Provided are a wide-angle lens, a camera module having a wide-angle lens, and a camera having a camera module having a wide-angle lens. A first group includes a first lens and a second lens each having a negative refractive power. A second group includes a third lens and a fourth lens each having a positive refractive power. The third group includes a fifth lens and a sixth lens each having a positive refractive, a seventh lens having a negative refractive power, and an eighth lens having a positive refractive power, the sixth lens and the seventh lens form a cemented body. The wide-angle lens, the camera module and the camera adopt eight glass lenses.