NOVELTY - Hydrogen generating apparatus has cylindrical chemical reaction container (20) which generates hydrogen by chemical reaction from a raw material, material supply part (1) which supplies raw material to chemical reaction container, hydrogen gas discharge part (8) which discharges generated hydrogen, face panel (60) with rectangular cylinder shape which surrounds the chemical reaction container, vacuum heat insulating material (50) and non-vacuum heat insulating material (30, 40) positioned in the space between chemical reaction container and face panel.    USE - Hydrogen generating apparatus for fuel cell power generating device.    ADVANTAGE - The cost of apparatus is reduced by reducing the usage amount of high-cost vacuum heat insulating material, the swelling deformation by heating is not constrained, leakage of heat is prevented, efficient, space-saving and lifetime is improved.    DETAILED DESCRIPTION - Hydrogen generating apparatus has cylindrical chemical reaction container (20) which generates hydrogen by chemical reaction from a raw material, material supply part (1) which supplies raw material to chemical reaction container, hydrogen gas discharge part (8) which discharges generated hydrogen, face panel (60) with rectangular cylinder shape which surrounds the chemical reaction container, vacuum heat insulating material (50) and non-vacuum heat insulating material (30, 40) positioned in the space between chemical reaction container and face panel. The non-vacuum heat insulating material is positioned in the space formed between the corner part of the inner side of face panel and the outer peripheral surface of chemical reaction container. The vacuum heat insulating material is positioned on a part of the space between the face panel and outer peripheral surface of chemical reaction container.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-section of the structure of hydrogen forming apparatus.    Chemical reaction container (20)    Non-vacuum heat insulating material (30, 40)    Vacuum heat insulating material (50)    Face panel (60)