METHOD FOR OPERATING A HYDROGEN GENERATOR

The invention discloses a hydrogen generator (100A) comprising: a reformer (1) having a reforming catalyst (1a); a material gas supply device (13); an evaporator (3); a water supply device; and a controller (10) which controls the material gas supply device (13) and the water supply device to stop supplying of a material gas to the reformer (1) and supplying of water to the evaporator (3) and then controls the material gas supply device (13) to supply the material gas to the reformer (1) in a period during which residual water evaporates in at least either the evaporator (3) or the reformer (1).