A medical product usage status checking apparatus comprising: a medical product including at least one light-emissive constituent member which includes a luminescent agent emitting near-infrared fluorescence according to irradiation of excitation light on a surface thereof, wherein even in a case where a portion of the constituent member is separated as a separate piece from the constituent member due to damage, the luminescent agent is also included on a surface of the separate piece ; an irradiation unit which includes a light source emitting excitation light which excites the luminescent agent and irradiates the medical product with the excitation light emitted from the light source; an optical filter which blocks the excitation light and transmits the near-infrared fluorescence emitted by the luminescent agent; an imaging unit which receives the near-infrared fluorescence passing through the optical filter; and a display unit which displays an image captured by the imaging unit , wherein an image based on the near-infrared fluorescence of the constituent member is displayed on the display unit , and in a case where damage occurs in the constituent member, an image based on the near-infrared fluorescence of the separate piece is displayed on the display unit, characterised in that the apparatus further comprises a control unit which informs that damage occurs in the constituent member in a case where a first light-emitting region based upon the near-infrared fluorescence of the constituent member and a second light-emitting region based upon the near-infrared fluorescence of the separate piece of which area is smaller than that of the first light-emitting region are detected from the image based on the near-infrared fluorescence. a medical product including at least one light-emissive constituent member which includes a luminescent agent emitting near-infrared fluorescence according to irradiation of excitation light on a surface thereof, wherein even in a case where a portion of the constituent member is separated as a separate piece from the constituent member due to damage, the luminescent agent is also included on a surface of the separate piece ; an irradiation unit which includes a light source emitting excitation light which excites the luminescent agent and irradiates the medical product with the excitation light emitted from the light source; an optical filter which blocks the excitation light and transmits the near-infrared fluorescence emitted by the luminescent agent; an imaging unit which receives the near-infrared fluorescence passing through the optical filter; and a display unit which displays an image captured by the imaging unit , wherein an image based on the near-infrared fluorescence of the constituent member is displayed on the display unit , and in a case where damage occurs in the constituent member, an image based on the near-infrared fluorescence of the separate piece is displayed on the display unit, characterised in that the apparatus further comprises a control unit which informs that damage occurs in the constituent member in a case where a first light-emitting region based upon the near-infrared fluorescence of the constituent member and a second light-emitting region based upon the near-infrared fluorescence of the separate piece of which area is smaller than that of the first light-emitting region are detected from the image based on the near-infrared fluorescence. <EOS>