1. The present invention provides an eperisone pharmaceutical composition having improved preservability and pH stability, the composition containing 20-60 wt% of eperisone or a pharmaceutically acceptable salt thereof; 1-30 wt% of at least one acidifier selected from D-glucaric acid, D-glucoascorbic acid, gluconic acid, D-glucuronic acid, gluconolactone, glucuronolactone, glutamic acid, itaconic acid, caffeic acid, glycyrrhizic acid, ethane sulfonic acid, benzene sulfonic acid, dehydroascoribic acid, salicylic acid, salicyl sulfonic acid, gallic acid, nicotinic acid, and chlorogenic acid; 0.3-8 wt% of a binder; and 10-80 wt% of a diluent.