Abstract: A microparticle measuring apparatus and microparticle measuring method which, in sample liquids having different electric conductivities, have a sensitivity and accuracy which are necessary and sufficient, without performing pretreatment of reducing the electric conductivity are provided. The microparticle measuring apparatus includes: a cell 1 into which a liquid containing microparticles is to be introduced; at least one pair of electrodes which are immersed in the cell 1; a migration power supply unit 4 which applies an AC voltage of a frequency at which a dielectrophoretic force on the microparticles is equal to or larger than a predetermined value, between the pair of electrodes; a measurement unit 5 which measures the microparticles in the cell; and a control calculation unit 6 which calculates a result of the measurement performed by the measurement unit, and which calculates the concentration of the microparticles in the liquid.

Abstract: A sample liquid analytical chip that whilst being of simple structure, has a reaction region and a detection region isolated from each other and further has liquid feed control means for a sample liquid, thereby realizing speedy reliable analysis. The sample liquid analytical chip comprises a tubular sample liquid transfer channel with its both ends open, a reaction reagent layer disposed on the internal wall surface of the sample liquid transfer channel and a detection region for detecting any physical or chemical change of the sample liquid. In the sample liquid analytical chip, the sample liquid transfer channel at an area of its wall surface is provided an opening and a lid fitted to the opening. Portion of the lid forms a hinge in cooperation with the wall surface.