There is provided a fuel cell power generation system in which power loss in a power line electrically connecting a stack and a power conversion circuit, thereby attaining high power generation efficiency. A reformer and the stack are disposed in a main body package. Stack output terminals 31 are provided in both ends in a stacking direction of the stack. A power conversion circuit is disposed in the main body package and arranged in the proximity to the stack. Power conversion circuit input terminals are provided on the power conversion circuit and arrayed in a direction parallel to the stacking direction of the stack. Stack output lines electrically connect the stack output terminals and the power conversion circuit input terminals.