FOOT SIZE MEASURING IMPLEMENT, AND FOOT SIZE MEASURING IMPLEMENT SET

To provide a foot size measuring implement capable of measuring the ball girth and the instep girth easily, without wrapping a measuring portion around. A foot size measuring implement 1 comprises a first worn article 5 and a second worn article 70, wherein: the first worn article 5 includes a sock-shaped covering portion 12, and scale display portions 40, 50; and the second worn article 70 includes a covering portion 72, a ball girth measuring portion 100, and an instep girth measuring portion 120. The covering portions 12, 72 are formed from a material that is elastic and flexible, and the scale display portions 40, 50, the ball girth measuring portion 100, and the instep girth measuring portion 120 are formed from an inelastic material. The foot size measuring implement 1 is worn on the foot, the length between end portions of a strip-shaped portion 102 and the length between end portions of a strip-shaped portion 122 are measured using the scale display portions 40, 50, and the lengths of the ball girth a