A hydrogen supplying apparatus mounted on an electric vehicle. The electric vehicle is driven by electricity generated at a fuel cell by an electrochemical reaction between hydrogen stored in a hydrogen storage tank and oxygen. The hydrogen supplying apparatus includes: a hydrogen supply passage for supplying hydrogen from the hydrogen storage tank to the fuel cell; a bypass passage arranged in parallel with the hydrogen supply passage and for supplying hydrogen to the fuel cell; a purifier provided in the bypass passage, the purifier purifying hydrogen to be supplied to the fuel cell; and a switch valve selectively switching the hydrogen supply passage and the bypass passage.