NOVELTY - The desulfurizer has a container having fuel inlet port and fuel exit hole, connector (4) for fuel introduction and connector (5) for fuel discharge. A fuel introducing portion is fixed to fuel discharge portion such that the outer-periphery edge portion of each connector covers the inlet port and exit hole, to make the container contact the connectors. The fuel introducing/discharge portion has a closed portion in the center of flow side space of fuel in proximal section of desulfurizing agent. An opening portion is formed in outer periphery of closed portion.    USE - Desulfurizer used for desulfurization of gaseous fuel such as liquefied natural gas (LPG) and town gas, in hydrogen production apparatus of fuel cell system. Can also be used for desulfurization of liquid fuel.    ADVANTAGE - The dispersibility of fuel to the periphery portion can be improved, while suppressing increase of flow rate in the center portion. Hence the contacting efficiency of fuel and desulfurizing agent is improved and the desulfurization efficiency is increased. The degree of freedom in the design of desulfurization container increases, and size reduction of fuel cell system can be attained.    DETAILED DESCRIPTION - The closed portion and the circular arc-shaped opening portion are formed in the planar portion of the polygonal-prism shaped container. The opening portion is doubly formed in radial direction. A partition plate is arranged in the inner side of vessel bottom wall to divide the inside of container. The position where the plate is arranged is separated from the container upper wall, and the fuel introducing and discharge portions are formed in it. The plate is further equipped with a dispersing plate fixed in a gap formed between the bottom walls in parallel with the vessel bottom wall. The dispersing plate is extended equally to the center portion vicinity of each space partitioned off with the plate. The closed portion and the opening portion are formed at one end portion of the connector.    DESCRIPTION OF DRAWING(S) - The drawing shows the enlarged sectional views of the principal portion of desulfurizer.    Connector for fuel introduction (4)    Connector for fuel discharge (5)    Top plate (21)    Base plate (22)    Inlet port closing portion (23a)    Inlet port opening portion (23b)    Exit closing portion (24a)    Exit opening portion (24b)