Objective lens for endoscope and endoscope

An objective lens for an endoscope consisting of, in order from the object side, a front group having negative refractive power, an aperture stop and a rear group having positive refractive power,

• wherein the front group consists of, in order from the object side, a first lens having negative refractive power and a first cemented lens consisting of, in order from the object side, a second lens having negative refractive power and a third lens having positive refractive power cemented together, and
• wherein the rear group consists of, in order from the object side, a fourth lens having positive refractive power and a second cemented lens consisting of, in order from the object side, a fifth lens having positive refractive power and a sixth lens having negative refractive power cemented together, and
• wherein the following conditional expressions (1) and (2) are satisfied:
• −0.8<f/fA<−0.2 (1);
• and
• |νd2−νd3|<15.0 (2), where
• f:
• a focal length of an entire system,
• fA:
• a focal length of the front group,
• νd2:
• an Abbe number of the second lens for d-line, and
• νd3:
• an Abbe number of the third lens for d-line.