We present measurements of the microlensing optical depth and event rate toward the Galactic bulge using the data set from the 2006 to 2014 MOA-II survey, which covers 22 bulge fields spanning ∼42 deg2 between ‑5° < l < 10° and ‑7° < b < ‑1°. In the central region with ∣l∣ < 5°, we estimate an optical depth of and an event rate of Γ = [16.08 ± 0.28] × 10‑6 using a sample consisting of 3525 microlensing events, with Einstein radius crossing times of tE < 760 days and a source star magnitude of Is < 21.4 mag. We confirm our results are consistent with the latest measurements from the OGLE-IV 8 yr data set. We find our result is inconsistent with a prediction based on Galactic models, especially in the central region with ∣b∣ < 3°. These results can be used to improve the Galactic bulge model, and more central regions can be further elucidated by upcoming microlensing experiments, such as the PRime-focus Infrared Microlensing Experiment and Nancy Grace Roman Space Telescope.