Polyolefin having excellent processability and process for preparing same

An olefin-based polymer which has a density of 0.930 to 0.970 g/cm3, a melt index (I2.16) measured with a load of 2.16 kg at 190° C. of 0.1 to 5.0 g/10 min, a ratio (melt flow ratio;

• MFR) between a melt index (I21.6) measured with a load of 21.6 kg and a melt index (I2.16) measured with a load of 2.16 kg at 190° C. of 30 to 200, a unimodal molecular weight distribution having a shoulder when measured by gel permeation chromatography (GPC), and a shear rate defined by the following Equation 1 at which a melt fracture or shark skin is shown when measured with a capillary rheometer, of 500 sec−1 or more:
• γ
• ap
• =
• 4
• ⁢
• V
• π
• ⁢
• R
• 3
• [
• Equation
• ⁢
• 1
• ]
• wherein γap is an apparent shear rate (sec−1), V is a volume flow (mm3/sec) produced by a piston, and R is a radius (mm) of a round hole capillary.