Optical analysis device and combined analysis device

An optical analysis device that analyzes a sample by irradiating an optical cell containing the sample with light, and detecting light transmitted through the optical cell, the optical analysis device comprising:

• a first light source and a second light source each emitting light in a spectrum different from a spectrum of another;
• an optical element that reflects a part and transmits another part of incident light that has a first face on which the light from the first light source becomes incident and a second face on which the light from the second light source becomes incident;
• a first light output port provided on a light path of light emitted from the first light source and reflected on the first face, and light emitted from the second light source and transmitted through the second face;
• and
• a second light output port provided on a light path of light emitted from the first light source and transmitted through the first face,
• wherein the lights emitted from the first light output port and the second light output port toward the optical cell have mutually different spectra.