A method of manufacturing a hydrogen generating apparatus and a hydrogen generating apparatus manufactured using this method are disclosed. The method includes: inserting an elastic member inside a reactor, which has one side open; inserting an electrode, to which a wire is connected, and an aqueous electrolyte solution inside the elastic member; placing a cover, in which a through-hole is formed, on the open side of the reactor, such that a portion of the wire is positioned outside the reactor; and connecting the portion of the wire positioned outside the reactor to a control unit. Using this method, the inner materials remaining inside the reactor can be removed in a simple manner after the reaction, and replacement costs can be saved as the reactor itself does not have to be replaced.