Automated analysis device

An automatic analysis apparatus comprising:

• a light source that generates light having a center wavelength equal to or shorter than 340 nm;
• a fluorescent substance that is excited with the light of the light source to emit light, and that generates light having a wavelength of 340 nm to 800 nm, together with transmitted light from the light source;
• a condenser lens;
• a first slit;
• a second slit;
• a reaction cell that holds a reaction solution in which a specimen and a reagent are mixed, and both the light from the light source and the light from the fluorescent substance enter the reaction cell;
• and
• a detector that detects light transmitted through the reaction cell,
• wherein the light source, the fluorescent substance, the condenser lens, the first slit and the second slit are provided along a straight line corresponding to an optical axis,
• wherein the first slit is provided between a front focal point of the condenser lens and the fluorescent substance, and the second slit is provided between a rear focal point of the condenser lens and the reaction cell,
• wherein the width of an opening of the first slit is equal to or narrower than the width of a ray forming an image of the light source at the position of the first slit, and
• wherein the width of an opening of the second slit is equal to or narrower than the width of a ray forming an image of the light source at the position of the second slit.