Objective lens for an endoscope and endoscope

An objective lens for an endoscope consisting of, in order from an object side to an image side, a first lens group having positive optical power;

• and a second lens group having positive optical power,
• wherein during focusing from a farthest point object to a nearest point object, the first lens group is fixed to an image plane, and only the second lens group moves along an optical axis,
• the first lens group includes a single lens having negative optical power closest to the object side, and
• in a case where a maximum image height is denoted by Y,
• a focal length of the objective lens for an endoscope in a state where the farthest point object is in focus is denoted by fF,
• a maximum half angle of view in the state where the farthest point object is in focus is denoted by ωf,
• a focal length of the first lens group is denoted by f1,
• a focal length of the second lens group is denoted by f2, and
• a focal length of the single lens is denoted by fL1,
• conditional expressions (1), (2), and (3) are satisfied, which are represented by
• 0<Y/(fF×tan ωf)<0.6 (1),
• 0<f1/f2<0.25 (2), and
• −1.2<fL1/fF<0 (3).