We present a study of the molecular gas in five closely-separated (R⊥ < 20 kpc) dual quasars (Lbol ≳ 1044 erg s−1) at redshifts 0.4 < z < 0.8 with the Atacama Large Millimeter/submillimeter Array. The dual quasar phase represents a distinctive stage during the interaction between two galaxies for investigating quasar fueling and feedback effects on the gas reservoir. The dual quasars were selected from the Sloan Digital Sky Survey and Subaru/Hyper Suprime-Cam Subaru Strategic Program, with confirmatory spectroscopic validation. Based on the detection of the CO J=2–1 emission line with Band 4, we derive key properties including CO luminosities, line widths, and molecular gas masses for these systems. Eight quasars, of the ten in pairs, have line detections exceeding 5σ that result in molecular gas masses (Mmolgas) between 109.7 − 10.7 M⊙. The molecular gas-to-stellar mass ratios (μmolgas) of these dual quasars are between 18-50% with the exception of 301%, which are similar to the single quasars in mergers and inactive star-forming galaxies. The results indicate no clear evidence of molecular gas depletion attributed to dual quasar activities on global scale. However, intriguing gas features in certain systems appear to show possible signatures of AGN feedback effect.