Abstract: A reagent reaction container includes a container body having a plurality of receiving bores through top and bottom sides thereof, a plurality of filter holders mounted in the receiving bores respectively and each having a through hole through top and bottom sides thereof and an engagement portion engaged with a periphery wall of the respective receiving bore, a plurality of drain elements mounted in the through holes of the filter holders respectively, and a plurality of filters respectively mounted in the through holes of the filter holders and supported on the respective drain element. The drain element has a crevice that is closed when the drain element receives no pressure and is opened when the drain element receives a predetermined external force.