NOVELTY - A hydrogen generating apparatus (1) comprises reaction container (2) containing modification part (3) which makes a raw material and water react and generates a hydrogen-containing gas, and carbon monoxide reduction part (4) which reduces the carbon monoxide contained in hydrogen-containing gas, heating part (5) which heats the reaction container, heat insulating material which covers outer peripheral part of the reaction container, and 1st clearance gap which is formed between the vicinity part of the modification part of reaction container, and heat insulating material.    USE - Hydrogen generating apparatus for supplying fuel gas to fuel cell.    ADVANTAGE - The apparatus can generate fuel gas with high hydrogen content.    DETAILED DESCRIPTION - A hydrogen generating apparatus (1) comprises reaction container (2) containing modification part (3) which makes a raw material and water react and generates a hydrogen-containing gas, and carbon monoxide reduction part (4) which reduces the carbon monoxide contained in hydrogen-containing gas, heating part (5) which heats the reaction container, heat insulating material which covers outer peripheral part of the reaction container, 1st clearance gap which is formed between the vicinity part of the modification part of reaction container, and heat insulating material, 2nd clearance gap which is formed between the vicinity part of carbon monoxide reduction part of reaction container, and heat insulating material, heat insulating material convex part in inner peripheral part of heat insulating material, and container convex part on outer peripheral part of the reaction container. The heat insulating material convex part and container convex part are heated by heating part.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic sectional view of the state at the time of starting the hydrogen generating apparatus. (Drawing includes non-English language text).    Hydrogen generating apparatus (1)    Reaction container (2)    Modification part (3)    Carbon monoxide reduction part (4)    Heating part (5)