Liquefied gas storage tank and ship comprising same

A liquefied gas storage tank according to one embodiment of the present invention may comprise: a tank unit in which liquefied gas is stored; a pump unit which is provided inside the tank unit and which sucks the liquefied gas stored inside the tank unit through a liquid inlet pipe part and supplies the liquefied gas to the outside; and an inner tank unit which is provided with a backflow prevention part for allowing the liquefied gas to flow in only but not flow out, and which is provided so as to surround the liquid inlet pipe part. 根据本发明的一个实施例的液化气储罐可包括：罐体单元，其中储存有液化气；泵单元，其设置在所述罐体单元内部，用于通过进液管部吸入储存在所述罐体单元内部的所述液化气并供应到外部；以及内箱单元，其具备用于使所述液化气只流入不流出的防逆流部，并且设置成围绕所述进液管部周围。