Patent ID: 8405048

Claim:
A fluorescence detection device for measuring fluorescence emitted from a measurement object by irradiation with a laser beam, comprising: a flow cell body including a flow channel through which a measurement object flows; a laser light source unit that irradiates, with a laser beam, the measurement object passing through a measurement point in the flow channel; a light-receiving unit that receives fluorescence emitted from the measurement object irradiated with the laser beam and outputs a light-reception signal; and a processing unit that outputs an output value of fluorescence intensity based on the light-reception signal outputted by the light-receiving unit, wherein the flow cell body has a lens provided on a surface thereof so as to traverse an optical path of the laser beam, and wherein when the lens is virtually cut along a plane including the measurement point of the measurement object and being perpendicular to a moving direction of the measurement object, the lens has a cross-section constituting a part of a circle of which center is located at the measurement point.