EP 3 800 016 A1 tip 12, may be from 5.00 to 7.02 micrometers. [0060] The thickness T64 of the substrate 10 measured at a distance D64, which is 64 micrometers from the substrate tip 12, may be from 7.69 micrometers to 12.90 micrometers. [0061] The thickness T100 of the substrate 10 measured at a distance D100, which is 100 micrometers from the substrate tip 12, may be from 10.5 micrometers to 19.5 micrometers. [0062] The thickness of a person’s body hair is generally about 100 micrometers. That is, a section of the shaving blade that is involved in cutting the body hair in shaving may be within around T100 of the substrate 10. [0063] Accordingly, the thickness section from T16 to T100 is an area actually involved in cutting the body hair on the cutting edge 11, and thus, may have a greater influence on the cutting force of the shaving blade than the thickness in the section beyond T100. [0064] R16 obtained by dividing the thickness T16 measured at a distance D16, which is 16 micrometers from the substrate tip 12, by D16 may be greater than or equal to R100 obtained by dividing the thickness T100 measured at a distance D100, which is 100 micrometers from the substrate tip 12, by D100. [0065] In addition, R16 obtained by dividing the thickness T16 measured at a distance D16, which is 16 micrometers from the substrate tip 12, by D16 may be less than or equal to at least one of R4 obtained by dividing the thickness T4 measured at a distance D4, which is 4 micrometers from the substrate tip 12, by D4 and R8 obtained by dividing the thickness T8 measured at a distance D8, which is 8 micrometers from the substrate tip 12, by D8. [0066] RX, according to its definition, may be proportional to the average slope of both sides 13 and 14 of the cutting edge 11 in the section from the substrate tip 12 to DX. For example, when R16 is greater than R100, this means that the average slope of the cutting edge 11 from the substrate tip 12 to D16 is greater than the average slope of the cutting edge 11 from the substrate tip 12 to D100. [0067] R16 isgreaterthan R100 in the section beyond D16,and lessthan one ormore ofR4 and R8,which correspond to the section within D16. Accordingly, the cutting edge 11 may generally have a convex shape in the section from the substrate tip 12 to D100. The convex shape of the substrate 10 may improve the durability and physical properties of the shaving blade. [0068] The difference between the thickness T32 measured at a distance D32, which is 32 micrometers from the substrate tip 12, and the thickness T16 measured at a distance D16, which is 16 micrometers from the substrate tip 12, may be less than or equal to 4.61 micrometers. [0069] In addition,thedifference between the thickness T100 measured ata distance D100,which is 100 micrometers from the substrate tip 12, and the thickness T16 measured at distance D16, which is 16 micrometers from the substrate tip 12, may be less than or equal to 17.09 micrometers. [0070] The difference between TX and TY may be proportional to the average slope of both sides 13 and 14 of the cutting edge 11 in the section from DX to DY. [0071] Accordingly, a large difference between TX and TY means that the slope of both sides 13 and 14 of the cutting edge 11 is steep in the section from DX to DY. Conversely, a small difference between TX and TY means that the slope of both sides 13 and 14 of the cutting edge 11 is gentle in the section from DX to DY. [0072] Since the shaving blade according to an embodiment of the present disclosure has a relatively small thickness in the section from T16 to T100, it may have a relatively gentle slope in the section from T16 to T100. [0073] FIG. 3 shows a schematic profile of a cutting edge 11 of a substrate 10 on which a plurality of coating layers is laminated according to an embodiment of the present disclosure. [0074] Referring to FIG. 3, the shaving blade may include a plurality of coating layers laminated on the substrate 10. [0075] Thepluralityofcoating layersmayinclude afirstcoating layer20,a second coating layer 30, and a thirdcoating layer 40. The first coating layer 20, the third coating layer 40, and the second coating layer 30 may be laminated on the substrate 10 in this order. [0076] The first coating layer 20 may be laminated on the surface of the substrate 10 to complement the rigidity of the substrate 10. [0077] The first coating layer 20 may contain one or more of CrB, CrC, and Diamondlike carbon (DLC). However, the present disclosure is not limited thereto. [0078] The thickness of the first coating layer 20 may be from 150 nanometers to 300 nanometers. [0079] When the first coating layer 20 has a thickness of 150 nanometers or less, the durability of the entire shaving blade may follow thebehavior of the substrate10.In thiscase,an excessive damage may be caused to thesubstrate 10. [0080] On the other hand, when the first coating layer 20 has a thickness of 300 nanometers or more, the durability of the entire shaving blade may follow the behavior of the first coating layer 20. In this case, the cutting force of the shaving blade may increase, and the first coating layer 20 may be peeled off the surface of the substrate 10. [0081] The second coating layer 30 may be laminated on the third coating layer 40. However, the present disclosure is not limited thereto. For example, the shaving blade may not include the third coating layer 40. In this case, the second coating layer 30 may be directly laminated on the first coating layer 20. [0082] The second coating layer 30 may reduce friction between the shaving blade and the skin. 6 55 50 45 40 35 30 25 20 15 5 10