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.