A measuring device 1 for immunochromatographic test strip 5a is configured to irradiate measurement light onto the immunochromatographic test strip 5a and to measure light from the immunochromatographic test strip 5a, and is provided with a photodiode 3a for receiving the light from the immunochromatographic test strip 5a, and a measuring head 4 disposed between the immunochromatographic test strip 5a and the photodiode 3a and having a plurality of light paths 3b, 3b, 3b, 3b for guiding part of the light from the immunochromatographic test strip 5a to the photodiode 3a. The measuring head 4 functions as a light shielding member for shielding against unwanted light reflected on the immunochromatographic test strip 5a. The plurality of light paths 3b, 3b, 3b, 3b are juxtaposed along a direction in which a colored portion 8 of line shape formed on the immunochromatographic test strip 5a extends.