a third ratio R4 obtained by dividing a thickness T4, measured at a distance D4 that is 4 micrometers from the substrate tip, by the distance D4; or a fourth ratio R8 obtained by dividing a thickness T8, measured at a distance D8 that is 8 micrometers from the substrate tip, by the distance D8. 

5 

7. The shaving blade of any one of claims 1 to 6, wherein a difference between a thickness T32 of the substrate, measured at a distance D32 that is 32 micrometers from the substrate tip, and the thickness T16 of the substrate, measured at the distance D16, is less than or equal to 4.61 micrometers. 

8. The shaving blade of any one of claims 1 to 7, wherein a difference between a thickness T100 of the substrate, measured ata distance D100 that is 100 micrometers from the substrate tip, and the thickness T16 of the substrate, measured at the distance D16, is less than or equal to 17.09 micrometers. 

10 

9. The shaving blade of any one of claims 1 to 8, further comprising: a first coating layer laminated on the substrate and a second coating layer laminated on the first coating layer. 

15 

10. The shaving blade of claim 9, wherein a thickness of the first coating layer is in a range from 150 nanometers to 300 nanometers. 

11. The shaving blade of any one of claims 9 or 10, wherein: 

20 

the second coating layer comprises a blade tip formed at a position corresponding to the substrate tip; and a value obtained by dividing a distance between the substrate tip and the blade tip by a vertical height from one surface of the cutting edge to a surface of the second coating layer is in a range from 1.92 to 2.00. 

25 

12. The shaving blade of any one of claims 1 to 11, further comprising: 

30 

35 

40 

45 

50 

55 

a first coating layer laminated on the substrate; a third coating layer laminated on the first coating layer; and a second coating layer laminated on the third coating layer, wherein a thickness of the third coating layer is in a range from 5 nanometers to 30 nanometers. 

