A cell detection device, comprising: a flow cell through which a measurement specimen that contains particles is caused to flow; a particle detection part configured to detect the particles in the measurement specimen supplied to the flow cell; a particle sorting part configured to sort particles that satisfy a detection condition and other particles on the basis of the result of detection performed by the particle detection part; a specimen supply part configured to supply, to the flow cell, an image-capture specimen that includes detection-condition-satisfying particles that have been sorted by the particle sorting part; and a particle-image-capture part configured to capture images of the particles in the image-capture specimen supplied to the flow cell, wherein: the specimen supply part comprises: a recirculation flow path for allowing the specimen that has passed a detection position of the particle detection part to be re-circulated upstream of the detection position of the flow cell, and to flow into the flow cell again as the image-capture specimen; and being characterised by comprising an intermediate reservoir part arranged in the recirculation flow path and configured to accumulate the image-capture specimen that includes detection-condition-satisfying particles that have been sorted by the particle sorting part, wherein the intermediate reservoir part is configured to concentrate the image-capture specimen that includes detection-condition-satisfying particles that have been sorted by the particle sorting part, and is configured to supply the concentrated image-capture specimen to the flow cell. a flow cell through which a measurement specimen that contains particles is caused to flow; a particle detection part configured to detect the particles in the measurement specimen supplied to the flow cell; a particle sorting part configured to sort particles that satisfy a detection condition and other particles on the basis of the result of detection performed by the particle detection part; a specimen supply part configured to supply, to the flow cell, an image-capture specimen that includes detection-condition-satisfying particles that have been sorted by the particle sorting part; and a particle-image-capture part configured to capture images of the particles in the image-capture specimen supplied to the flow cell, wherein: the specimen supply part comprises: a recirculation flow path for allowing the specimen that has passed a detection position of the particle detection part to be re-circulated upstream of the detection position of the flow cell, and to flow into the flow cell again as the image-capture specimen; and being characterised by comprising an intermediate reservoir part arranged in the recirculation flow path and configured to accumulate the image-capture specimen that includes detection-condition-satisfying particles that have been sorted by the particle sorting part, wherein the intermediate reservoir part is configured to concentrate the image-capture specimen that includes detection-condition-satisfying particles that have been sorted by the particle sorting part, and is configured to supply the concentrated image-capture specimen to the flow cell. a recirculation flow path for allowing the specimen that has passed a detection position of the particle detection part to be re-circulated upstream of the detection position of the flow cell, and to flow into the flow cell again as the image-capture specimen; and being characterised by comprising an intermediate reservoir part arranged in the recirculation flow path and configured to accumulate the image-capture specimen that includes detection-condition-satisfying particles that have been sorted by the particle sorting part, wherein the intermediate reservoir part is configured to concentrate the image-capture specimen that includes detection-condition-satisfying particles that have been sorted by the particle sorting part, and is configured to supply the concentrated image-capture specimen to the flow cell.