In the electrochemical high-pressure hydrogen generating equipment, a hydrogen storage electrode contg. at least a hydrogen storage metal or its alloy, and its counter electrode are soaked in an electrolyte, respectively. The hydrogen storage electrode is contacted with the electrolyte contg. a surface modifying agent. The counter electrode is kept away from the electrolyte contg. the surface modifying agent by means of a separating membrane having functions for passing through H+ or OH-, yet for depressing surface modifying agent permeation. The hydrogen storage electrode has an inner space for storing hydrogen stored by voltage application, or its isotope as a high-pressure gas.    Also claimed is an actuator, where at least part of a hydrogen storage electrode contg. at least a hydrogen storage metal or its alloy, and at least part of its counter electrode are soaked in an electrolyte, respectively. The hydrogen storage electrode is kept into contact with the electrolyte contg. a surface modifying agent. The counter electrode is kept away from th electrolyte contg. the surface modifying agent by means of a separating membrane having functions for passing through H+ or OH-, yet for depressing surface modifying agent permeation. The hydrogen storage electrode has an inner space for storing hydrogen stored by voltage application, or its isotope as a high-pressure gas. The gas pressure of the hydrogen generated in the inner space of the hydrogen storage electrode by applying a voltage to both the electrodes, or its isotope is used as a power source.    Also claimed is that in the energy obtaining equipment; (a) a hydrogen storage electrode contg. at least a hydrogen storage metal or its alloy, and its counter electrode are soaked in a heavy water electrolyte, respectively; (b) the hydrogen storage electrode is kept away from the electrolyte contg. the surface modifying agent by means of a separating membrane having functions for passing through H_ or OH-, yet for depressing surface modifying agent permeation; (c) the hydrogen storage electrode has an inner space for storing heavy water stored by voltage application as a high-pressure gas; (d) voltage application to both the electrodes evolves a difference in the concn. of hydrogen passing through the hydrogen storage electrode. A heat outputting device for delivering heat generated by heavy water electrolysis is inserted in the inner space of the hydrogen storage electrode.    USE -   For providing high-pressure hydrogen gas. The actuator uses the gas pressure of the high-pressure hydrogen gas yielded from the hydrogen generating equipment as a power source. The energy obtaining equipment uses heat generated by heavy water electrolysis.    ADVANTAGE -   The equipment yields high hydrogen gas pressure with min. hydrogen overvoltage; without a power source, including a compressor to reduce the scale of a high-pressure hydrogen gas generating facilities. The actuator easily controls hydrogen gas pressure by controlling voltage applied to the hydrogen storage electrode. Soft operation and quick transfer speed owing to the use of the hydrogen gas pressure generated from the hydrogen generating equipment. The energy obtaining device easily generates heat. The hydrogen gas is obtd. inexpensively and gives hydrogen of high purity. No surface modifying agent is decomposed on the counter electrodes. The counter electrode does not deteriorate or degrade, preventing a decrease in hydrogen generation.