Colorimetric bio sensor

A colorimetric bio sensor comprising:

• an upper housing including a blood cell separation module which separates blood plasma from blood injected from the outside and spreads the separated blood plasma, and a specimen delivery hole which is located on the lower end of the blood cell separation module and formed to penetrate the upper housing, so that the lower end of the blood cell separation module is exposed to the outside;
• and
• a lower housing including a membrane containing a colorimetric reaction substance capable of causing a colorimetric reaction with a target substance in the blood plasma by being in contact with the blood cell separation module through the specimen delivery hole such that fluid communication is established therebetween, and a protrusion located on the lower end of the membrane,
• wherein the protrusion is formed to protrude to a height corresponding to a depth of the specimen delivery hole such that, when the protrusion is inserted into the specimen delivery hole, the protrusion presses the membrane positioned on an upper end of the protrusion into contact with the blood cell separation module,
• wherein the upper housing further includes a compression member at the upper portion of the specimen delivery hole, and
• wherein the compression member and the protrusion include magnets, such that when the upper housing and the lower housing are coupled, the blood cell separation module is compressed by a magnetic force via the magnets.