A human body-mounted measuring device and a measuring method capable of measuring a predetermined operation with high accuracy are provided. When a human body wearing type measuring device is attached to a human body by a mounting unit for mounting on the human body, a variation detecting unit for detecting a variation in distance between a predetermined part of the human body, and the mounting unit, A posture detection unit that detects the posture of the variation detection unit, and a measurement unit that measures the number of predetermined operations based on the variation detected by the variation detection unit and the posture detected by the posture detection unit. The fluctuation detection unit includes a light emitting unit and a light receiving unit, emits light from the light emitting unit, detects reflected light reflected at a predetermined site by the light receiving unit, detects a distance to the predetermined site, and according to the detected distance Output electrical signals (voltage or current) at a predetermined sampling period. [Selection] Figure 4【課題】所定動作を精度良く計測することができる人体装着型計測装置及び計測方法を提供する。【解決手段】人体装着型計測装置は、人体に装着するための装着部と、人体の所定部位との間の距離の変動を検出する変動検出部と、装着部により人体に装着した場合に、変動検出部の姿勢を検出する姿勢検出部と、変動検出部で検出した変動及び姿勢検出部で検出した姿勢に基づいて、所定動作の回数を計測する計測部とを備える。変動検出部は、発光部及び受光部を備え、発光部から光を発光させ、所定部位で反射した反射光を受光部で検出して、所定部位までの距離を検出し、検出した距離に応じた電気信号（電圧又は電流）を所定のサンプリング周期で出力する。【選択図】図４
