A super absorbent polymer comprising: a base polymer powder including a cross-linked polymer obtained by crosslinking polymerization of a water-soluble ethylenically unsaturated monomer having an acidic group of which at least a part is neutralized in the presence of an encapsulated foaming agent; and a surface cross-linked layer that is further cross-linked from the cross-linked polymer and is formed on the base polymer powder, wherein the encapsulated foaming agent has a structure including a core containing hydrocarbon and a shell surrounding the core and formed of a thermoplastic resin, and has a maximum expansion size in air of 20 to 190 μm, wherein the maximum expansion size is measured as disclosed in the specification, wherein the encapsulated foaming agent has a maximum expansion ratio in air of 8.5 to 10 times, wherein the expansion ratio is measured as disclosed in the specification, wherein the hydrocarbon is at least one selected from the group consisting of n-propane, n-butane, iso-butane, cyclobutane, n-pentane, iso-pentane, cyclopentane, n-hexane, iso-hexane, cyclohexane, n-heptane, iso-heptane, cycloheptane, n-octane, iso-octane, and cyclooctane, and wherein the thermoplastic resin is a copolymer of (meth)acrylate and (meth)acrylonitrile, wherein an initial absorption capacity of the super absorbent polymer, calculated according to the following Calculation Formula 1 is at least 30 g/g. Initial absorption capacity g / g = W 2 g − W 1 g / W 0 g − 1 wherein in Calculation Formula 1, W 0 (g) is an initial weight(g) of the super absorbent polymer, W 1 (g) is a weight of a nonwoven fabric-made empty bag not containing the super absorbent polymer, which is measured after immersing the empty bag not containing the super absorbent polymer in a physiological saline solution at 36°C for 1 minute, and then dehydrating the empty bag by gravity for 1 minute, and W 2 (g) is a weight of a nonwoven fabric-made bag containing the polymer, which is measured after immersing and absorbing the bag containing the polymer in a physiological saline solution at 36°C for 1 minute, and then dehydrating the same by gravity for 1 minute. wherein the encapsulated foaming agent has a structure including a core containing hydrocarbon and a shell surrounding the core and formed of a thermoplastic resin, and has a maximum expansion size in air of 20 to 190 μm, wherein the maximum expansion size is measured as disclosed in the specification, wherein the encapsulated foaming agent has a maximum expansion ratio in air of 8.5 to 10 times, wherein the expansion ratio is measured as disclosed in the specification, wherein the hydrocarbon is at least one selected from the group consisting of n-propane, n-butane, iso-butane, cyclobutane, n-pentane, iso-pentane, cyclopentane, n-hexane, iso-hexane, cyclohexane, n-heptane, iso-heptane, cycloheptane, n-octane, iso-octane, and cyclooctane, and wherein the thermoplastic resin is a copolymer of (meth)acrylate and (meth)acrylonitrile, wherein an initial absorption capacity of the super absorbent polymer, calculated according to the following Calculation Formula 1 is at least 30 g/g. Initial absorption capacity g / g = W 2 g − W 1 g / W 0 g − 1 wherein in Calculation Formula 1, W 0 (g) is an initial weight(g) of the super absorbent polymer, W 1 (g) is a weight of a nonwoven fabric-made empty bag not containing the super absorbent polymer, which is measured after immersing the empty bag not containing the super absorbent polymer in a physiological saline solution at 36°C for 1 minute, and then dehydrating the empty bag by gravity for 1 minute, and W 2 (g) is a weight of a nonwoven fabric-made bag containing the polymer, which is measured after immersing and absorbing the bag containing the polymer in a physiological saline solution at 36°C for 1 minute, and then dehydrating the same by gravity for 1 minute.