HAIR HOLDING TOOL AND HAIR TREATMENT METHOD USING SAME

A hair holder (1) of the present invention has a tubular body (2) which has: a first opening (21) located at one end; and a second opening (22) located at the other end, and which is configured to allow a lock of hair (H) to be inserted from the first opening (21) toward the second opening (22) and to be capable of being rolled up. The tubular body (2) has a longitudinal direction and a width direction that is orthogonal to the longitudinal direction. The tubular body (2) has two sheets that form outer surfaces. At least one of the two sheets is formed of a color-changeable sheet that satisfies conditions (1) and (2) below: (1) an L∗ value in an L∗a∗b∗ color coordinate space is 90 or less; and (2) a color difference ΔE∗ab value in the L∗a∗b∗ color coordinate space between before and after impregnation with a standard hair treatment agent is 1.0 or greater. The standard hair treatment agent contains ammonium thioglycolate in an amount of 6 mass%, ammonium hydrogencarbonate in an amount of 2 mass%, and disodium edetate in an amount of 0.5 mass%, the balance being water, and the standard hair treatment agent is adjusted to a pH of 8.4 at 20°C using a 28 mass% aqueous solution of ammonia.