PROBLEM TO BE SOLVED: To provide a simple hair measuring instrument enabling a user to measure the thickness and density of hair on his/her own, as conventional measurement has needed large-scale instruments and environment though simple hair measurement methods enabling the observation by himself/herself are desired because male pattern alopecia occurring to 30 percent of the male population has a long progress, or there have been no simple hair measuring instrument as a guide because the thickness and density of hair are individually quite different.SOLUTION: A hair measurement window is arranged in the center, in four directions of the measurement window, a scale displaying hair diameter measurement lines, which are ten lines of about 3 mm length becoming thicker by 0.01 mm from 0.01 mm to 0.1 mm, vertically, horizontally, in the right oblique 45° direction and in the left oblique 45° direction is attached to the tip of focusing cylinder, and the rear end includes a measuring lens part arranged with a macro lens and a fixture fixing the measuring lens part to a camera of portable communication tool with a camera.SELECTED DRAWING: Figure 6【課題】 男性人口の3割を占める男性型脱毛症は、経過が長いため、自ら観察できる簡易な毛髪計測方法が望まれるが、従来の毛髪計測にはおおがかりな器具や環境を要していた。また、毛髪の太さ、密度は個人差が大きく、目安となる簡易な毛髪計測器具はなかった。本発明は、毛髪の太さや密度を自ら計測できる簡易な毛髪計測器具を提供する。【解決手段】 中央に毛髪計測窓が設けられ、その計測窓の四方には、0.01mm~0.1mmまで0.01mmずつ太くなる、長さ約3mmの10本の毛髪径計測線が縦、横、右斜め45度、左斜め45度に表示されているスケールを焦点調節用筒先端に設け、その後端にはマクロレンズを設置した計測レンズ部と、カメラ付き携帯通信機器のカメラに、計測レンズ部を固定する固定具を有することを特徴とする毛髪計測器具。【選択図】図6