Target substance detection chip, target substance detection device, and target substance detection method

A target substance detection device comprising:

• a detection chip including an entirely approximately plate-shaped light transmissive member, the light transmissive member comprising:
• a sensing surface arranged on a surface constituting a top surface relative to a bottom surface,
• an inclined surface which is one of
• an upwardly inclined surface inclined away from the sensing surface from the top surface toward the bottom surface side with respect to a thickness direction and
• a downwardly inclined surface inclined away from the sensing surface from the bottom surface toward the top surface side with respect to the thickness direction, and
• a main body portion capable of receiving light and guiding the light through an interior thereof,
• the light transmissive member having a light directing structure which is one of
• a first light directing structure in which the light applied from the top surface side and passed through the upwardly inclined surface is directed via the main body portion to the sensing surface under a condition of total reflection and
• a second light directing structure in which the light applied from the top surface side and reflected at the downwardly inclined surface is directed via the main body portion to the sensing surface under the condition of total reflection;
• a light irradiation unit disposed on the side of the top surface of the light transmissive member and operable to irradiate the sensing surface with the light under the condition of total reflection via the light directing structure;
• and
• a magnetic field application unit disposed on the side of the bottom surface of the light transmissive member;
• wherein the light transmissive member comprises at least one notch portion out of a top surface side notch portion formed in the top surface and having the upwardly inclined surface and a bottom surface side notch portion formed in the bottom surface and having the downwardly inclined surface.