We report the design and performance of a piezoresistive immersion rheometer for the measurement of steady shear viscosity and shear stress. This rheometer is a strain-controlled device incorporating a piezoresistor. When an immersed plate connected to a piezoresistive cantilever moves through a liquid-filled trough, the shear force from surrounding fluid bends the cantilever changing its resistance which is analyzed by data acquisition device and LabVIEW software. The linear relationship between the shear stress acting on the plate and the change in the resistance of the piezoresistor was shown by a calibration process. The general empirical equation correlating shear stress and other physical parameters was derived using dimensional analysis. This device allows us to measure the shear viscosity of Newtonian and non-Newtonian fluid from 0.1 to 1,000 Pa s, shear stresses from 0.3 to 30 Pa, and shear rate from 6 × 10-3 to 10 s-1 with a few milliliters of fluid samples. We demonstrate the capability of the device with the empirical equation by measuring the shear viscosity and shear stress of Newtonian (honey), and non-Newtonian (xanthan gum solution) fluid. This piezoresistive immersion rheometer can be built without a complex process enabling on-line measurement. Keywords: Rheometry, shear viscosity, shear stress, piezoresistive effect, bending of a beam.