A refillable lipstick case comprising: an outer shell having a hollow cylindrical body with a sidewall, the outer shell having an opening at a proximal end and an opening at a distal end thereof; a cover removably secured to the outer shell; a refill configured to be detachably received at least partially within the hollow cylindrical body of the outer shell; wherein the refill further comprises an inner shell, an inner body, a spiral body, a cup and a plug; wherein the spiral body has an upper portion connected to the inner body and a lower portion connected to the plug, and wherein the spiral body has an elongated hollow body provided with helical threads on an inner surface of the spiral body; wherein the cup includes a cylindrical cup forming a seat for receiving a stick of a cosmetic product and a drive rod extending downwardly from a bottom surface of the cylindrical cup; wherein a bottom end portion of the drive rod is configured to be received in the elongated hollow body of the spiral body such that protrusions present on the drive rod engage with helical threads of the spiral body wherein the drive rod passes through a hole provided on a top end face of inner body; wherein a lower portion of the inner shell is fixedly connected on an outer surface of the inner body; wherein a middle part of the spiral body is a bulged portion, and a lower surface of the bulged portion is provided with a plurality of reinforcing ribs in a radial arrangement, wherein the plug includes a sidewall and a bottom wall and a cavity for receiving the lower portion of the spiral body; wherein the sidewall of the plug includes a plurality of grooves; wherein the plurality of grooves are radially spaced and extend lengthwise from an upper edge of the sidewall of the plug, and wherein the plurality of grooves receives the reinforcing ribs of the spiral body when the plug and the spiral body are fixed together. an outer shell having a hollow cylindrical body with a sidewall, the outer shell having an opening at a proximal end and an opening at a distal end thereof; a cover removably secured to the outer shell; a refill configured to be detachably received at least partially within the hollow cylindrical body of the outer shell; wherein the refill further comprises an inner shell, an inner body, a spiral body, a cup and a plug; wherein the spiral body has an upper portion connected to the inner body and a lower portion connected to the plug, and wherein the spiral body has an elongated hollow body provided with helical threads on an inner surface of the spiral body; wherein the cup includes a cylindrical cup forming a seat for receiving a stick of a cosmetic product and a drive rod extending downwardly from a bottom surface of the cylindrical cup; wherein a bottom end portion of the drive rod is configured to be received in the elongated hollow body of the spiral body such that protrusions present on the drive rod engage with helical threads of the spiral body wherein the drive rod passes through a hole provided on a top end face of inner body; wherein a lower portion of the inner shell is fixedly connected on an outer surface of the inner body; wherein a middle part of the spiral body is a bulged portion, and a lower surface of the bulged portion is provided with a plurality of reinforcing ribs in a radial arrangement, wherein the plug includes a sidewall and a bottom wall and a cavity for receiving the lower portion of the spiral body; wherein the sidewall of the plug includes a plurality of grooves; wherein the plurality of grooves are radially spaced and extend lengthwise from an upper edge of the sidewall of the plug, and wherein the plurality of grooves receives the reinforcing ribs of the spiral body when the plug and the spiral body are fixed together.