A hydrogen generation device includes a container; a hydrogen generation unit configured to generate a hydrogen-containing gas; a combustion unit configured to combust a part of the hydrogen-containing gas; a sensor unit including a thermal deformation member, configured to sense a concentration of a combustible gas in an exhaust gas by further combusting the exhaust gas and sensing a physical deformation of the thermal deformation member caused in a temperature change by the combustion of the exhaust gas; and a shutoff valve configured to shut off a discharge of the exhaust gas in conjunction with the physical deformation.