The utility model provides an endoscopy-used objective lens which is small in diameter and good in optical performance, and an endoscopy provided with the endoscopy-used objective lens. The endoscopy-used objective lens basically comprises a first lens group G1 with negative focal power, a diaphragm and a second lens group G2 with positive focal power sequentially from the objective side, wherein the first lens group G1 comprises a negative lens; and the second lens group G2 comprises no less than two lenses. The focus of the first lens group is set to be f1, the focus of the entire system is set to be f, and a conditional expression (1): -0.9