| 摘要 |
The present invention relates to a low-cost zoom lens which has high optical performance specifications such as a wide angle of view and a high zoom ratio of as high as 5, is extremely small in depth and ensures that the optical path of the optical system can easily be bent by a reflecting optical element. A zoom lens includes a first lens group G 1 with a positive power, a second lens group G 2 with a negative power, a third lens group G 3 with a positive power, a fourth lens group G 4 with a positive power, a fifth lens group G 5 with a negative power, and a sixth lens group G 6 with a positive power, wherein upon zooming from a wide-angle end to telephoto end, the first lens group G 1 remains fixed relative to an image surface I and at least second and fourth lens groups G 2 and G 4 move, the first lens group G 1 includes, in order from the object side, a negative lens, a reflecting optical element P for bending an optical path, and a positive lens, and conditional expression (1) is satisfied.
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