A gasket for a refrigerator door is provided. The gasket includes a body configured to be arranged between a main body of a refrigerator and a refrigerator door, and a magnet inserted to the body and arranged to be attached to or detached from the main body of the refrigerator. The body includes, by weight % (wt %), about 30 to 60% of thermoplastic resin, about 20 to 40% of plasticizer, about 3 to 30% of filler, and one or more other additives. The filler is provided with one or more hollow particles or a porous material having a diameter of about 1 to 100 μm, the filler having a heat conductivity of about 0.0001 to 0.2 W/m·K