PROBLEM TO BE SOLVED: To provide a pedometer capable of calculating precise total consumption calories by easily detecting the precise number of steps and determining an exercise state (walking, running, walking up the stairs, and walking down the stairs) only with a triaxial acceleration sensor.SOLUTION: The pedometer comprises a triaxial acceleration sensor 20 and exercise state determination means 33. The triaxial acceleration sensor 20 measures acceleration generated accompanying walking of a person to be measured respectively for triaxial directions orthogonal to each other. The exercise state determination means 33 determines which of walking, running, walking up the stairs and walking down the stairs is an exercise state of the person to be measured, on the basis of an exercise state determination value for which the maximum value Azmax of the acceleration Az in the vertical direction measured by the triaxial acceleration sensor 20 while walking of one step is performed is averaged for two steps and divided by the time &Deltat required for the two steps, and an acceleration average value Ayave which is the average value for the two steps of the acceleration in an advancing direction.COPYRIGHT: (C)2012,JPO&INPIT【課題】3軸の加速度センサのみで簡易に正確な歩数を検出し、併せて運動状態(歩行、走行、階段上り及び階段下り)を判定して、正確な総消費カロリーの算出を可能とする歩数計を提供するものである。【解決手段】3軸加速度センサ20と運動状態判定手段33とを備える。3軸加速度センサ20は、被測定者の歩行に伴って生じる加速度を、互いに直交する3軸方向についてそれぞれ測定する。運動状態判定手段33は、一歩の前記歩行がされる間に前記3軸加速度センサ20によって測定した、上下方向における加速度Azの最大値Azmaxを2歩分平均し、該2歩に要した時間Δtで除した値である運動状態判断値及び、進行方向における前記加速度の前記2歩分の平均値である加速度平均値Ayaveに基づいて、前記被測定者の運動状態が歩行、走行、階段上り及び階段下りのいずれであるかを判定する。【選択図】図1
