A particle photographing device 2 includes: an illumination optical system 13 that illuminates particles with sheet-like illumination light based on laser light from an end of an optical fiber 7; an imaging portion 6 that images the illuminated particles; and a regulation portion 14 that changes the distance between the end of the optical fiber 7 and the illumination optical system 13. A circuit board is arranged on an upper surface of the base, and includes a circuit board protruding portion arranged to protrude radially outward of the housing. The signal is amplified with the variable gain amplifier by the first gain value or the second gain value.