It is known that the extinction law toward the Galactic bulge (GB) is very different from the well-known Cardelli's standard extinction law. Most studies have been conducted with NIR and only a small portion of the inner GB has been studied with optical imaging due to the high extinction. These studies showed that the observed \(A_V/A_K\) is 60-80% higher than the estimate from the standard extinction law. To measure the intrinsic brightness of and/or distance to the objects toward the inner GB, it is critical to understand the amount of extinction that depends on the wavelengths. Also, such study will be important for optical precursor, concurrent and follow-up observations of the GB surveys such as, Roman’s RGES, JASMINE and PRIME surveys. We observed bout 30 sq. deg around the Galactic center to measure the optical extinction with Subaru HSC using g, r2, i2 and z-band filters. We measure the color and magnitude of Red Clump Giant in the color-magnitude-diagram of each sight line by combining VISTA VVV survey data. We find that the extinction toward the inner GB could be explained by a hybrid model of the standard and NIR extinction model. In this talk, we report and discuss our result.