An infrared light condensing apparatus comprising: a light source for emitting a light incident onto a specimen or excite an outgoing light scattered or emitted by said specimen, a solid immersion lens for accepting said incident light or emitting said outgoing light, said solid immersion lens having a base plane on which said specimen is to be disposed; cantilever holding an antenna, said antenna facing said base plane, having a length in the longitudinal direction of said cantilever, and having a probe disposed away from a base plane of said solid immersion lens at a distance not more than 1/4 of an effective wavelength of the light; and a position control means for controlling the position of a pointed tip of said probe by means of said cantilever, wherein the effective wavelength λ eff of a light refers to a wave defined by λ eff = λ / [εo+εs] 1/2 where εo is dielectric constant of vacuum, εs is dielectric constant of said immersion lens and λ is vacuum wavelength, wherein said antenna (4, 12) is made of an electric conductor having a length that is one half of the effective wavelength of said incident or outgoing light to condense said incident light upon causing it to geometrically resonate or to pick up a near-field from said specimen in a region of the pointed tip of said probe upon causing it to geometrically resonate and then to emit it as a wave propagating in the medium of said solid immersion lens, whereby operating said position control means allows: said incident light to concentrate as a near-field at a desired position of said specimen on said base plane of said solid immersion lens or a near-field from a desired position of said specimen to be converted into a propagating wave corresponding thereto and then said propagating wave to be emitted as said outgoing light from said solid immersion lens. a light source for emitting a light incident onto a specimen or excite an outgoing light scattered or emitted by said specimen, a solid immersion lens for accepting said incident light or emitting said outgoing light, said solid immersion lens having a base plane on which said specimen is to be disposed; cantilever holding an antenna, said antenna facing said base plane, having a length in the longitudinal direction of said cantilever, and having a probe disposed away from a base plane of said solid immersion lens at a distance not more than 1/4 of an effective wavelength of the light; and a position control means for controlling the position of a pointed tip of said probe by means of said cantilever, wherein the effective wavelength λ eff of a light refers to a wave defined by λ eff = λ / [εo+εs] 1/2 where εo is dielectric constant of vacuum, εs is dielectric constant of said immersion lens and λ is vacuum wavelength, wherein said antenna (4, 12) is made of an electric conductor having a length that is one half of the effective wavelength of said incident or outgoing light to condense said incident light upon causing it to geometrically resonate or to pick up a near-field from said specimen in a region of the pointed tip of said probe upon causing it to geometrically resonate and then to emit it as a wave propagating in the medium of said solid immersion lens, whereby operating said position control means allows: said incident light to concentrate as a near-field at a desired position of said specimen on said base plane of said solid immersion lens or a near-field from a desired position of said specimen to be converted into a propagating wave corresponding thereto and then said propagating wave to be emitted as said outgoing light from said solid immersion lens. said incident light to concentrate as a near-field at a desired position of said specimen on said base plane of said solid immersion lens or a near-field from a desired position of said specimen to be converted into a propagating wave corresponding thereto and then said propagating wave to be emitted as said outgoing light from said solid immersion lens.