An electromagnetic wave detection apparatus 10 includes a first image forming unit 15, a prism 17 having a fourth surface s3 for emitting electromagnetic waves incident from the first image forming unit 15, a progression unit 16 that includes a plurality of pixels arranged along a reference surface and is configured to cause electromagnetic waves incident on the reference surface from a fourth surface s4 to progress in a particular direction using each of the pixels, and a first detector 19 configured to detect electromagnetic waves progressing in the particular direction. The prism 17 includes a reflection suppressor 90 that is provided at a position out of a progression path of electromagnetic waves incident from the first image forming unit 15 to be detected by the first detector 19.