An electromagnetic wave detection apparatus comprising: a first image forming unit configured to form an image of incident electromagnetic waves; a progression unit (18, 18', 18"', 180) that includes a plurality of pixels (px) arranged along a reference surface (ss) and is configured to cause electromagnetic waves incident on the reference surface (ss) from the first image forming unit to progress in a first direction (d1) using each of the pixels (px); a second image forming unit configured to form an image of electromagnetic waves progressing in the first direction (d1); and a first detector configured to detect incident electromagnetic waves from the second image forming unit , wherein an angle formed by a progression axis at each angle of view of electromagnetic waves that have passed the first image forming unit and a principal axis of the first image forming unit is equal to or smaller than a predetermined value, wherein the electromagnetic wave detection apparatus further comprises a first aperture that is arranged in the vicinity of a front focal point of the first image forming unit and allows some incident electromagnetic waves to pass through, wherein the first image forming unit forms an image of incident electromagnetic waves from the first aperture , wherein the first aperture and the first image forming unit constitute an image side telecentric optical system, and wherein the first image forming unit is configured such that the progression axes at each of the angles of view of the electromagnetic waves that have passed the first image forming unit and are incident on the progression unit (18, 18', 18"', 180) are approximately parallel to one another. a first image forming unit configured to form an image of incident electromagnetic waves; a progression unit (18, 18', 18"', 180) that includes a plurality of pixels (px) arranged along a reference surface (ss) and is configured to cause electromagnetic waves incident on the reference surface (ss) from the first image forming unit to progress in a first direction (d1) using each of the pixels (px); a second image forming unit configured to form an image of electromagnetic waves progressing in the first direction (d1); and a first detector configured to detect incident electromagnetic waves from the second image forming unit , wherein an angle formed by a progression axis at each angle of view of electromagnetic waves that have passed the first image forming unit and a principal axis of the first image forming unit is equal to or smaller than a predetermined value, wherein the electromagnetic wave detection apparatus further comprises a first aperture that is arranged in the vicinity of a front focal point of the first image forming unit and allows some incident electromagnetic waves to pass through, wherein the first image forming unit forms an image of incident electromagnetic waves from the first aperture , wherein the first aperture and the first image forming unit constitute an image side telecentric optical system, and wherein the first image forming unit is configured such that the progression axes at each of the angles of view of the electromagnetic waves that have passed the first image forming unit and are incident on the progression unit (18, 18', 18"', 180) are approximately parallel to one another. <EOS>