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We investigate effects of hardness of primordial binaries on whole evolutionof star clusters by means of N-body simulations. Using newly developed code,GORILLA, we simulated eleven N=16384 clusters with primordial binaries whosebinding energies are equal in each cluster in range of 1-300kT_0, where 1.5kT_0is average stellar kinetic energy at the initial time. We found that, in bothsoft (< 3kT_0) and hard (> 300kT_0) limits, clusters experience deep corecollapse. In the intermediate hardness (10-100kT_0), the core collapses halthalfway due to an energy releases of the primordial binaries. The core radii atthe halt can be explained by their energy

Effects of Hardness of Primordial Binaries on Evolution of Star Clusters