A liquefied gas tank including a hoistable an inner tub, the liquefied gas tank comprising: an outer wall ; an inner tub disposed inside the outer wall and configured to accommodate liquefied gas; and rafters disposed on a bottom surface of a roof and configured to define a framework, wherein rafter lugs for supporting the inner tub at the time of hoisting the inner tub are installed for the respective rafters formed in a circumferential direction of the roof and disposed at intervals in a peripheral direction of the tank , wherein stiffener lugs , which are connected to the rafter lugs with main ropes , are disposed at a periphery of a side plate of the inner tub and installed at intervals in a peripheral direction of the inner tub , and wherein a hoisting means is installed on the rafter lug , the hoisting means and the stiffener lug are connected with the main rope , and then the hoisting means is manipulated to hoist the inner tub , wherein the rafter lug comprises: a lug pad joined to the rafter ; and a lug plate formed to be perpendicular to a bottom surface of the lug pad , wherein the lug plate is formed on the lug pad to be inclined at a predetermined angle with respect to the rafter formed in a radial direction of the tank , characterized in that a band-shaped reinforcing plate for enhancing stiffness of the side plate is provided on the side plate and disposed along a periphery of the inner tub , wherein at both sides of the stiffener lug in the upper and lower portions of the reinforcing plate , stiffener plates are respectively installed to prevent deformation of the inner tub , and wherein support lugs are respectively installed on the side plate and the bottom periphery plate of the inner tub to prevent sagging of the bottom periphery plate , the support lugs are connected by wires each other. an outer wall ; an inner tub disposed inside the outer wall and configured to accommodate liquefied gas; and rafters disposed on a bottom surface of a roof and configured to define a framework, wherein rafter lugs for supporting the inner tub at the time of hoisting the inner tub are installed for the respective rafters formed in a circumferential direction of the roof and disposed at intervals in a peripheral direction of the tank , wherein stiffener lugs , which are connected to the rafter lugs with main ropes , are disposed at a periphery of a side plate of the inner tub and installed at intervals in a peripheral direction of the inner tub , and wherein a hoisting means is installed on the rafter lug , the hoisting means and the stiffener lug are connected with the main rope , and then the hoisting means is manipulated to hoist the inner tub , wherein the rafter lug comprises: a lug pad joined to the rafter ; and a lug plate formed to be perpendicular to a bottom surface of the lug pad , a lug pad joined to the rafter ; and a lug plate formed to be perpendicular to a bottom surface of the lug pad , wherein the lug plate is formed on the lug pad to be inclined at a predetermined angle with respect to the rafter formed in a radial direction of the tank , characterized in that a band-shaped reinforcing plate for enhancing stiffness of the side plate is provided on the side plate and disposed along a periphery of the inner tub , wherein at both sides of the stiffener lug in the upper and lower portions of the reinforcing plate , stiffener plates are respectively installed to prevent deformation of the inner tub , and wherein support lugs are respectively installed on the side plate and the bottom periphery plate of the inner tub to prevent sagging of the bottom periphery plate , the support lugs are connected by wires each other. <EOS>