A gas liquefaction plant comprising: a pre-cooling exchanger which pre-cools a feed gas by means of indirect heat exchange with a first refrigerant; a first refrigerant compressor which compresses the first refrigerant which has been used for refrigerating the feed gas in the pre-cooling exchanger; a cryogenic heat exchanger which refrigerates and liquefies the feed gas which has been pre-cooled by the pre-cooling exchanger by means of indirect heat exchange with a second refrigerant; a second refrigerant compressor which refrigerates the second refrigerant which has been used for cooling and liquefying the feed gas in the cryogenic heat exchanger; a heavy component removing facility which removes a heavy component in the feed gas therefrom, and which is installed between a first heat exchange area defined by the pre-cooling exchanger and the first refrigerant compressor, and a second heat exchange area defined by the cryogenic heat exchanger and the second refrigerant compressor; a pre-treatment facility which pretreats the feed gas before the feed gas is cooled by the pre-cooling exchanger, wherein the pre-treatment facility includes an acid gas removal facility which removes acid gases from the feed gas and a dehydrating facility in which the feed gas is dehydrated; piping via which the acid gas removal facility, the dehydrating facility, the pre-cooling exchanger, the heavy component removing facility and the cryogenic heat exchanger are connected; and a pipe rack for installing the piping, wherein the pre-cooling exchanger, the first refrigerant compressor, the cryogenic heat exchanger, and the second refrigerant compressor are installed at one side of the pipe rack in height, and the acid gas removal facility and the dehydrating facility included in the pre-treatment facility are installed at the other side of the pipe rack in height, wherein a refrigerant piping which connects the pre-cooling heat exchanger and the first refrigerant compressor, and another refrigerant piping which connects the cryogenic heat exchanger and the second refrigerant compressor are arranged without being installed in the pipe rack. a pre-cooling exchanger which pre-cools a feed gas by means of indirect heat exchange with a first refrigerant; a first refrigerant compressor which compresses the first refrigerant which has been used for refrigerating the feed gas in the pre-cooling exchanger; a cryogenic heat exchanger which refrigerates and liquefies the feed gas which has been pre-cooled by the pre-cooling exchanger by means of indirect heat exchange with a second refrigerant; a second refrigerant compressor which refrigerates the second refrigerant which has been used for cooling and liquefying the feed gas in the cryogenic heat exchanger; a heavy component removing facility which removes a heavy component in the feed gas therefrom, and which is installed between a first heat exchange area defined by the pre-cooling exchanger and the first refrigerant compressor, and a second heat exchange area defined by the cryogenic heat exchanger and the second refrigerant compressor; a pre-treatment facility which pretreats the feed gas before the feed gas is cooled by the pre-cooling exchanger, wherein the pre-treatment facility includes an acid gas removal facility which removes acid gases from the feed gas and a dehydrating facility in which the feed gas is dehydrated; piping via which the acid gas removal facility, the dehydrating facility, the pre-cooling exchanger, the heavy component removing facility and the cryogenic heat exchanger are connected; and a pipe rack for installing the piping, wherein the pre-cooling exchanger, the first refrigerant compressor, the cryogenic heat exchanger, and the second refrigerant compressor are installed at one side of the pipe rack in height, and the acid gas removal facility and the dehydrating facility included in the pre-treatment facility are installed at the other side of the pipe rack in height, wherein a refrigerant piping which connects the pre-cooling heat exchanger and the first refrigerant compressor, and another refrigerant piping which connects the cryogenic heat exchanger and the second refrigerant compressor are arranged without being installed in the pipe rack.