A fuel cell system, comprising: a fuel cell configured for generating an electric power with a reformed gas and with a cathode gas; a combustion portion for burning an anode-off gas outputted from the fuel cell; an evaporation portion being heated by the combustion portion, the evaporation portion generating a water vapor by evaporating a supplied reforming water; a reforming portion being heated by the combustion portion, the reforming portion generating the reformed gas with the water vapor and with a raw material for reformation; a reservoir storing the reforming water; a reforming water pump (11b2) for pumping the reforming water from the reservoir, the reforming water pump (11b2) discharging the reforming water toward the evaporation portion; a housing containing the evaporation portion and the reforming portion in a state where the evaporation portion and the reforming portion are communicated with each other, the housing including a bottom portion that is heated; a perforated plate being provided within the housing so as to define an upstream of the evaporation portion, the perforated plate having a plurality of holes (32a1) being penetrated therethrough; a granular material layer being provided between the reforming portion and the perforated plate; and a reforming water supply pipe including a first end and a second end (11b1), the first end being connected to an outlet of the reforming water pump (11b2), the second end (11b1) facing and opening to the perforated plate in a state where the second end (11b1) is spaced apart from the perforated plate, wherein the second end (11b1) of the reforming water supply pipe is spaced apart from the perforated plate by a predetermined distance in order for the reforming water discharged from the reforming water pump (11b2) to run down the perforated plate and to move towards the bottom portion of the housing, characterized in that the perforated plate is formed with a recessed portion (32a2), the second end (11b1) of the reforming water supply pipe is surrounded with the recessed portion (32a2) of the perforated plate in a state where the second end (11b1) is spaced apart from the recessed portion (32a2) by the predetermined distance, the system being configured so that the reforming water discharged from the water pump (11b2) is not directly dripped on the bottom portion of the housing and is dripped on the perforated plate, a portion of the reforming water dripped on the perforated plate is evaporated and the water vapor is generated, and another portion of the reforming water dripped on the perforated plate that is not evaporated runs down the perforated plate and moves towards the bottom portion of the housing, wherein the other portion of the reforming water is evaporated before reaching the bottom of the housing. a fuel cell configured for generating an electric power with a reformed gas and with a cathode gas; a combustion portion for burning an anode-off gas outputted from the fuel cell; an evaporation portion being heated by the combustion portion, the evaporation portion generating a water vapor by evaporating a supplied reforming water; a reforming portion being heated by the combustion portion, the reforming portion generating the reformed gas with the water vapor and with a raw material for reformation; a reservoir storing the reforming water; a reforming water pump (11b2) for pumping the reforming water from the reservoir, the reforming water pump (11b2) discharging the reforming water toward the evaporation portion; a housing containing the evaporation portion and the reforming portion in a state where the evaporation portion and the reforming portion are communicated with each other, the housing including a bottom portion that is heated; a perforated plate being provided within the housing so as to define an upstream of the evaporation portion, the perforated plate having a plurality of holes (32a1) being penetrated therethrough; a granular material layer being provided between the reforming portion and the perforated plate; and a reforming water supply pipe including a first end and a second end (11b1), the first end being connected to an outlet of the reforming water pump (11b2), the second end (11b1) facing and opening to the perforated plate in a state where the second end (11b1) is spaced apart from the perforated plate, wherein the second end (11b1) of the reforming water supply pipe is spaced apart from the perforated plate by a predetermined distance in order for the reforming water discharged from the reforming water pump (11b2) to run down the perforated plate and to move towards the bottom portion of the housing, characterized in that the perforated plate is formed with a recessed portion (32a2), the second end (11b1) of the reforming water supply pipe is surrounded with the recessed portion (32a2) of the perforated plate in a state where the second end (11b1) is spaced apart from the recessed portion (32a2) by the predetermined distance, the system being configured so that the reforming water discharged from the water pump (11b2) is not directly dripped on the bottom portion of the housing and is dripped on the perforated plate, a portion of the reforming water dripped on the perforated plate is evaporated and the water vapor is generated, and another portion of the reforming water dripped on the perforated plate that is not evaporated runs down the perforated plate and moves towards the bottom portion of the housing, wherein the other portion of the reforming water is evaporated before reaching the bottom of the housing.