Metal oxide catalysts, such as perovskite oxides, have attracted much attention as highly active oxygen evolution reaction (OER) catalysts for alkaline water electrolysis (AWE). The OER activities of most metal oxide catalysts were measured at relatively low current density (i.e., 10 mA cm−2) by using an ink-painted electrode because most metal oxides are synthesized as a powder. The ink-painted electrodes are unstable under high current densities, for example at 400 mA cm−2 which is the practical operation condition of AWE. Therefore, long-term durability test of powder metal oxide catalysts under practical condition has been quite limited, using the ink-painted electrodes. Here, we demonstrate a novel pressure-bonded electrode which is suitable for the measurement of OER activities of powdery catalysts under practical conditions (>400 mA cm−2). A perovskite oxide, LaNiO3, was used as a model catalyst. The pressure-bonded electrodes were prepared by uniaxial press at 262 MPa, cold isostatic press at 300 MPa, and calcination at 800 °C. The catalyst film was stable in the cyclic voltammetry measurements with the upper limit of the geometrical current density ca. 1800 mA cm−2 for 200 cycles. The specific activity of LaNiO3 was maximized when the loading amount was ca. 1 mg cm−2. The measured OER current density at the loading amount 1.2 mg cm−2 was higher than the most values reported in the literature at ca. 1.6 V vs. RHE and almost the same as the highest value, implying that the OER activity of the pressure-bonded electrodes mostly reflected the intrinsic activity of LaNiO3. Because of the high stability of the pressure-bonded electrodes, the long-term stability test was successfully performed at 400 mA cm−2 for 512 h. The increase in the iR-corrected cell voltage was 0.17 mV h−1. Consequently, the pressure-bonded electrode is shown to be useful to evaluate the electrode performance, such as long-term stability and accelerated durability tests, under practical current density.