A container for retort food, the container comprising: a tray part which has a predetermined area and a depth recessed in a downward direction and has a space open in an upward direction; and a flange part which constitutes a periphery of an upper end of the tray part, wherein the flange part comprises an outer flange area which constitutes an outer circumference of the container for retort food and an inner flange area which divides the tray part across the container for retort food, wherein the flange part comprises: a ridge portion which is formed on the flange part, has a closed curve shape to surround the tray part, and protrudes in the upward direction; and an exhaust hole which vertically passes through at least a portion of the flange part, wherein the ridge portion comprises an inner ridge formed on the inner flange area and an outer ridge formed on the outer flange area and branching from the inner ridge, wherein the exhaust hole is located in the inner flange area, the inner ridge has a branch ridge having a closed curve shape that branches with the exhaust hole therebetween and then joins, and the exhaust hole is located within the closed curve formed by the branch ridge, wherein the inner ridge has an intermediate ridge which connects the branch ridge with the outer ridge, wherein the intermediate ridge comprises a first intermediate line and a second intermediate line which are located on opposite sides of the branch ridge, and wherein the branch ridge comprises a first branch line and a second branch line which branch with the exhaust hole therebetween and are spaced apart from each other in a horizontal direction, characterized in that: at least one of the first branch line and the second branch line has a first tip end sharply protruding toward the tray part adjacent thereto, the first branch line and the second branch line branch from an end portion of the first intermediate line to be spaced apart from each other in the horizontal direction and then join an end portion of the second intermediate line, and a radius of curvature of the intermediate ridge is greater than a radius of curvature of the outer ridge. a tray part which has a predetermined area and a depth recessed in a downward direction and has a space open in an upward direction; and a flange part which constitutes a periphery of an upper end of the tray part, wherein the flange part comprises an outer flange area which constitutes an outer circumference of the container for retort food and an inner flange area which divides the tray part across the container for retort food, wherein the flange part comprises: a ridge portion which is formed on the flange part, has a closed curve shape to surround the tray part, and protrudes in the upward direction; and an exhaust hole which vertically passes through at least a portion of the flange part, wherein the ridge portion comprises an inner ridge formed on the inner flange area and an outer ridge formed on the outer flange area and branching from the inner ridge, wherein the exhaust hole is located in the inner flange area, the inner ridge has a branch ridge having a closed curve shape that branches with the exhaust hole therebetween and then joins, and the exhaust hole is located within the closed curve formed by the branch ridge, wherein the inner ridge has an intermediate ridge which connects the branch ridge with the outer ridge, wherein the intermediate ridge comprises a first intermediate line and a second intermediate line which are located on opposite sides of the branch ridge, and wherein the branch ridge comprises a first branch line and a second branch line which branch with the exhaust hole therebetween and are spaced apart from each other in a horizontal direction, characterized in that: a ridge portion which is formed on the flange part, has a closed curve shape to surround the tray part, and protrudes in the upward direction; and an exhaust hole which vertically passes through at least a portion of the flange part, wherein the ridge portion comprises an inner ridge formed on the inner flange area and an outer ridge formed on the outer flange area and branching from the inner ridge, wherein the exhaust hole is located in the inner flange area, the inner ridge has a branch ridge having a closed curve shape that branches with the exhaust hole therebetween and then joins, and the exhaust hole is located within the closed curve formed by the branch ridge, wherein the inner ridge has an intermediate ridge which connects the branch ridge with the outer ridge, wherein the intermediate ridge comprises a first intermediate line and a second intermediate line which are located on opposite sides of the branch ridge, and wherein the branch ridge comprises a first branch line and a second branch line which branch with the exhaust hole therebetween and are spaced apart from each other in a horizontal direction, characterized in that: at least one of the first branch line and the second branch line has a first tip end sharply protruding toward the tray part adjacent thereto, the first branch line and the second branch line branch from an end portion of the first intermediate line to be spaced apart from each other in the horizontal direction and then join an end portion of the second intermediate line, and