The present invention relates to an aqueous composition for a hard capsule, the composition having an improved degree of gelation, and to a hard capsule produced using the aqueous composition. The present invention enables the production of an aqueous composition for a hard capsule, the composition having an excellent degree of gelation due to comprising a gelation agent and a gelation auxiliary agent along with water-soluble cellulose ether, alcohol and water, and as a result a high quality hard capsule having improved hard capsule moldability can be produced. Furthermore, the alcohol improves the solubility of the water-soluble cellulose ether, and thus a stable gel power can be maintained by only a small amount of gelation agent, thereby resolving the problem of the gelation agent causing a drop in solubility time.