A molded object having a non-woven fiber structure, the molded object comprising: a polyester-based fiber; and a binder, wherein the binder is a non-hygroscopic copolymer resin and results, based on the molded object manufactured using the resin, in a molded object weight change rate of less than 0.1% after being left unattended for 100 hours at a temperature of 85°C and relative humidity of 85%, wherein the molded object has apparent density of 0.5 g/cm 3 to 0.8 g/cm 3, the difference in the density of the 15% outermost portion of the molded object in the thickness direction and the density of the ± 15% portion in the center of the molded object in the thickness direction is less than 3%, the difference between the thermal conductivity of the 15% outermost portion of the molded object in the thickness direction and the thermal conductivity of the ± 15% portion in the center of the molded object in the thickness direction is less than 10%, wherein the molded object is manufactured by a dry method including a) preparing a non-woven fabric by mixing the polyester-based fiber and a sheath-core type bicomponent fiber including a core part of the polyester-based fiber and a sheath part that is the nonhygroscopic copolymer resin surrounding the core part, and then heating and pressurizing the result; b) installing the prepared non-woven fabric on a plurality of unwinding devices, and then moving to a heating press; and c) manufacturing a molded object by heating and pressurizing a plurality of the non-woven fabrics moved to the heating press under a temperature condition of 170°C to 210°C and a pressure condition of 1 MPa to 10 MPa. a polyester-based fiber; and a binder, wherein the binder is a non-hygroscopic copolymer resin and results, based on the molded object manufactured using the resin, in a molded object weight change rate of less than 0.1% after being left unattended for 100 hours at a temperature of 85°C and relative humidity of 85%, wherein the molded object has apparent density of 0.5 g/cm 3 to 0.8 g/cm 3, the difference in the density of the 15% outermost portion of the molded object in the thickness direction and the density of the ± 15% portion in the center of the molded object in the thickness direction is less than 3%, the difference between the thermal conductivity of the 15% outermost portion of the molded object in the thickness direction and the thermal conductivity of the ± 15% portion in the center of the molded object in the thickness direction is less than 10%, wherein the molded object is manufactured by a dry method including a) preparing a non-woven fabric by mixing the polyester-based fiber and a sheath-core type bicomponent fiber including a core part of the polyester-based fiber and a sheath part that is the nonhygroscopic copolymer resin surrounding the core part, and then heating and pressurizing the result; b) installing the prepared non-woven fabric on a plurality of unwinding devices, and then moving to a heating press; and c) manufacturing a molded object by heating and pressurizing a plurality of the non-woven fabrics moved to the heating press under a temperature condition of 170°C to 210°C and a pressure condition of 1 MPa to 10 MPa. a) preparing a non-woven fabric by mixing the polyester-based fiber and a sheath-core type bicomponent fiber including a core part of the polyester-based fiber and a sheath part that is the nonhygroscopic copolymer resin surrounding the core part, and then heating and pressurizing the result; b) installing the prepared non-woven fabric on a plurality of unwinding devices, and then moving to a heating press; and c) manufacturing a molded object by heating and pressurizing a plurality of the non-woven fabrics moved to the heating press under a temperature condition of 170°C to 210°C and a pressure condition of 1 MPa to 10 MPa.