A method of manufacturing a product filled with hydrogen water, the method including filling a can container with hydrogen water, and sealing a can lid section onto a can trunk section, wherein the hydrogen water is filled and sealed in a state in contact with an inner surface of a can body, primary overflow overflows the hydrogen water from the can container in a process of filling the can container with the hydrogen water and secondary overflow overflows the hydrogen water from the can body in a process of attaching the can lid section to the can container are performed, and in the process of attaching the can lid section to the can container, the hydrogen water is pushed into the can container while a predetermined pressure is applied to the can lid section while the secondary overflow state is maintained and sealing of the can lid section is performed.
