NOVELTY - A hydrogen filling apparatus has a temperature detecting unit (14) for detecting temperature of a hydrogen occlusion alloy, a pressure detecting unit (15) for detecting pressure of hydrogen occlusion alloy, and a hydrogen filling unit. The hydrogen filling unit controls the filling pressure of hydrogen filled to the hydrogen occlusion tank, based on a signal from temperature and pressure detecting units.    USE - For supplying hydrogen to fuel cell and hydrogen engine of vehicle.    ADVANTAGE - The hydrogen filling apparatus reliably detects the characteristic changes of the hydrogen occlusion alloy. The hydrogen filling apparatus has high reliability, and supplies hydrogen at a desirable pressure to the hydrogen occlusion tank. The hydrogen filling apparatus controls an abnormal temperature rise of the hydrogen occlusion alloy. The filling pressure of the hydrogen is varied, depending on the internal pressure in the hydrogen occlusion tank and signal from the degradation detecting unit. Hence, hydrogen is filled at desirable pressure with respect to hydrogen occlusion alloy, irrespective of the reduction of plateaux pressure accompanied by degradation of hydrogen occlusion alloy and temperature rise. Also, hydrogen is filled within short time. The hydrogen filling unit desirably controls the filling pressure of hydrogen. The degradation of the hydrogen occlusion alloy is detected reliably by using the degradation detector.    DETAILED DESCRIPTION - A hydrogen filling apparatus has a hydrogen inflow port, a hydrogen occlusion tank (10) for storing a hydrogen occlusion alloy, a hydrogen filling source for supplying and filling hydrogen to the hydrogen inflow port, and a hydrogen filling line (11). The hydrogen filling apparatus further has a temperature detecting unit (14) for detecting temperature of the hydrogen occlusion alloy, a pressure detecting unit (15) for detecting pressure of the hydrogen occlusion alloy, and a hydrogen filling unit. The hydrogen filling unit controls the filling pressure of hydrogen filled to the hydrogen occlusion tank, based on a signal from the temperature and pressure detecting units.    An INDEPENDENT CLAIM is included for a degradation detector of hydrogen occlusion alloy which has the hydrogen occlusion tank, the hydrogen filling unit for filling hydrogen to the hydrogen occlusion alloy and a degradation judging unit. The degradation detector stores the temperature of the hydrogen occlusion alloy during the filling of hydrogen. When the temperature of the hydrogen occlusion alloy during hydrogen filling is greater than the temperature of the hydrogen occlusion alloy during previous hydrogen filling, the degradation judging unit judges whether the hydrogen occlusion alloy has deteriorated.    DESCRIPTION OF DRAWING(S) - The figure shows the above hydrogen filling apparatus. (Drawing includes non-English language text).    Hydrogen occlusion tank (10)    Hydrogen filling line (11)    Temperature detecting unit (14)    Pressure detecting unit (15)