The rear converter lens consists of, in order from an object side: a first lens group that has a positive refractive power; a second lens group that has a negative refractive power; and a third lens group that has a positive refractive power. The first lens group consists of a cemented lens in which a negative lens concave toward the image side and a positive lens convex toward the object side are cemented. The second lens group consists of a cemented lens in which a negative lens concave toward the image side, a positive lens convex toward both sides, and a negative lens concave toward the object side are cemented. The third lens group consists of a cemented lens in which a positive lens convex toward the object side and a negative lens are cemented. The rear converter lens satisfies predetermined Conditional Expressions (1) and (2).

The rear converter lens consists of, in order from an object side: a first lens group that has a positive refractive power; a second lens group that has a negative refractive power; and a third lens group that has a positive refractive power. The first lens group consists of a cemented lens in which a negative lens concave toward the image side and a positive lens convex toward the object side are cemented. The second lens group consists of a cemented lens in which a negative lens concave toward the image side, a positive lens convex toward both sides, and a negative lens concave toward the object side are cemented. The third lens group consists of a cemented lens in which a positive lens convex toward the object side and a negative lens are cemented. The rear converter lens satisfies predetermined Conditional Expressions (1) and (2).

The imaging lens comprises, successively in order from the object side, a positive first lens group that does not move during focusing, a second lens group that moves during focusing, a stop, and a positive third lens group that consists of all lenses moving integrally with the second lens group during focusing. The composite focal length of the second lens group and the third lens group is positive. The first lens group includes four or more positive lenses and three or more negative lenses. The imaging lens satisfies predetermined conditional expressions.

The imaging lens comprises, successively in order from the object side, a positive first lens group that does not move during focusing, a second lens group that moves during focusing, a stop, and a positive third lens group that consists of all lenses moving integrally with the second lens group during focusing. The composite focal length of the second lens group and the third lens group is positive. The first lens group includes four or more positive lenses and three or more negative lenses. The imaging lens satisfies predetermined conditional expressions.

An illumination device includes: a light source that emits parallel light or divergent light; a diffusion element that receives the light emitted from the light source and emits the light at a diffusion angle of 50 or more and 110 or less; and a lens group that has negative power, receives the light from the diffusion element by a first surface, and emits the light from a second surface at a light distribution angle of 140 or more.

An illumination device includes: a light source that emits parallel light or divergent light; a diffusion element that receives the light emitted from the light source and emits the light at a diffusion angle of 50 or more and 110 or less; and a lens group that has negative power, receives the light from the diffusion element by a first surface, and emits the light from a second surface at a light distribution angle of 140 or more.

A rear converter lens consists of, in order from the object side, a positive first lens group, a negative second lens group, and a positive third lens group. The first lens group consists of a cemented lens in which a negative lens concave toward the image side and a positive lens convex toward the object side are cemented, the second lens group consists of a cemented lens in which a negative lens concave toward the image side, a positive lens convex toward both sides, and a negative lens concave toward the object side are cemented, and the third lens group consists of, in order from the object side, a third lens group-first lens that is a positive lens convex toward the object side and a third lens group-second lens that is a negative lens.

The rear converter lens consists of, in order from an object side: a first lens group that has a positive refractive power; a second lens group that has a negative refractive power; and a third lens group that has a positive refractive power. The first lens group consists of a cemented lens in which a negative lens concave toward the image side and a positive lens convex toward the object side are cemented. The second lens group consists of a cemented lens in which a negative lens concave toward the image side, a positive lens convex toward both sides, and a negative lens concave toward the object side are cemented. The third lens group consists of a cemented lens in which a positive lens convex toward the object side and a negative lens are cemented. The rear converter lens satisfies predetermined Conditional Expressions (1) and (2).

A rear converter lens consists of three lens groups of, in order from its object-side, a first lens-group having positive refractive power; a second lens-group having negative refractive power; and a third lens-group having positive refractive power. The first lens-group consists of a cemented lens of a negative lens having a concave surface facing an image-side of the rear converter lens and a positive lens cemented together in order from the object-side. The second lens-group consists of a cemented lens of a negative lens, a lens having a biconvex shape, and a negative lens cemented together in order from the object-side. The third lens-group includes a lens having a convex surface facing the object-side furthest toward the object-side. When the focal length of the third lens-group is f3 and the focal length of the rear converter lens is cf, conditional expression (1) (1.9<f3/cf<0.4) is satisfied.

A rear converter lens consists of three lens groups of, in order from its object-side, a first lens-group having positive refractive power; a second lens-group having negative refractive power; and a third lens-group having positive refractive power. The first lens-group consists of a cemented lens of a negative lens having a concave surface facing an image-side of the rear converter lens and a positive lens cemented together in order from the object-side. The second lens-group consists of a cemented lens of a negative lens, a lens having a biconvex shape, and a negative lens cemented together in order from the object-side. The third lens-group includes a lens having a convex surface facing the object-side furthest toward the object-side. When the focal length of the third lens-group is f3 and the focal length of the rear converter lens is cf, conditional expression (1) (1.9<f3/cf<0.4) is satisfied.