HYDROGEN GENERATION DEVICE AND FUEL CELL SYSTEM

A hydrogen generation apparatus 100 of the present invention includes: a reformer 4 for generating a hydrogen-containing gas through a reforming reaction using a raw material gas; a raw material gas supplier 13 for supplying the raw material gas to the reformer 4; a methanator 6 for reducing carbon monoxide contained in the hydrogen-containing gas through a methanation reaction; and a controller for controlling the raw material gas supplier 13 to decrease an amount of the raw material gas supplied to the reformer 4 so as to decrease an amount of generation of the hydrogen-containing gas when a temperature of the methanator 6 increases.