A method of predicting the fatigue life of a hot stamped part having a Zn-Ni alloy coating layer in which about 9 mass% to 25 mass% Ni is contained in Zn as a coating layer with a high fusing point of 860 °C or more on a surface of a base steel sheet, the method comprising the following steps performed using a computer: an analysis model setting step of setting an analysis model of the hot stamped part; and setting thermal properties and mechanical properties of a tool of press forming and a blank sheet of the analysis model, the thermal properties and mechanical properties being temperature-dependent data; wherein the hot stamped part is formed using a die and a punch, includes a top portion, a vertical wall portion, and a flange portion, and has a hat cross-sectional shape; a forming condition setting step of setting a forming condition of the hot stamping and taking a temperature history of the blank sheet of the analysis model into consideration; a forming analysis step of performing forming analysis using the analysis model under the forming condition, and calculating an equivalent plastic strain in a surface layer of the hot stamped part, the forming analysis being thermal/structural coupled analysis coupling thermal analysis and structural analysis; and an evaluation step of evaluating a maximum micro-crackdepth, based on the equivalent plastic strain, using a correlation between analyzed equivalent plastic strain in the surface layer of the hot stamped part and maximum micro-crack depth in the hot stamped part, the correlation being obtained beforehand, and a portion subjected to the evaluation of the maximum micro-crack depth in the evaluation step is a portion of the vertical wall portion coming into contact with a shoulder R end of the die during the forming, wherein in the case where the maximum micro-crack depth evaluated in the evaluation step is 20 μm or less, degradation in fatigue life of the hot stamped part manufactured under the forming condition is evaluated as being within a tolerable range, and in the case where the maximum micro-crack depth evaluated in the evaluation step is more than 20 μm, degradation in fatigue life of the hot stamped part manufactured under the forming condition is evaluated as being outside the tolerable range. an analysis model setting step of setting an analysis model of the hot stamped part; and setting thermal properties and mechanical properties of a tool of press forming and a blank sheet of the analysis model, the thermal properties and mechanical properties being temperature-dependent data; wherein the hot stamped part is formed using a die and a punch, includes a top portion, a vertical wall portion, and a flange portion, and has a hat cross-sectional shape; a forming condition setting step of setting a forming condition of the hot stamping and taking a temperature history of the blank sheet of the analysis model into consideration; a forming analysis step of performing forming analysis using the analysis model under the forming condition, and calculating an equivalent plastic strain in a surface layer of the hot stamped part, the forming analysis being thermal/structural coupled analysis coupling thermal analysis and structural analysis; and an evaluation step of evaluating a maximum micro-crackdepth, based on the equivalent plastic strain, using a correlation between analyzed equivalent plastic strain in the surface layer of the hot stamped part and maximum micro-crack depth in the hot stamped part, the correlation being obtained beforehand, and a portion subjected to the evaluation of the maximum micro-crack depth in the evaluation step is a portion of the vertical wall portion coming into contact with a shoulder R end of the die during the forming, wherein in the case where the maximum micro-crack depth evaluated in the evaluation step is 20 μm or less, degradation in fatigue life of the hot stamped part manufactured under the forming condition is evaluated as being within a tolerable range, and in the case where the maximum micro-crack depth evaluated in the evaluation step is more than 20 μm, degradation in fatigue life of the hot stamped part manufactured under the forming condition is evaluated as being outside the tolerable range.