A method of detecting a gait parameter through a head part acceleration sensor, comprising: a gait acceleration collecting step of collecting an acceleration in a vertical direction of a pedestrian measured by an acceleration sensor disposed at a head part of the pedestrian; a gait point-in-time detecting step of setting a gait point-in-time by extracting a peak value in the acceleration in the vertical direction within a gait cycle including a standing phase and a swing phase and detecting a start point and an end point of a double-limb support on the basis of the peak value; and a gait parameter detecting step of detecting the double-limb support on the basis of the start point and the end point in order to analyze a gait posture of the pedestrian, wherein the start point and the end point of the double-limb support are set within a window predetermined on the basis of peaks of the gait cycle, the start point of the double-limb support is the same as an end point of a single-limb support, and the end point of the double-limb support is the same as a start point of a single-limb support characterized in that in the gait point-in-time detecting step, a gait jerk signal at a point-in-time in which an impact is applied to a ground when a limb moves from the single-limb support to the double-limb support is further detected by differentiating the acceleration in the vertical direction, and a peak value of the gait jerk signal located before the peak value of the acceleration in the vertical direction is set as the start point of the double-limb support, and a peak value of the gait jerk signal located after the peak value of the acceleration in the vertical direction is set as the end point of the double-limb support. a gait acceleration collecting step of collecting an acceleration in a vertical direction of a pedestrian measured by an acceleration sensor disposed at a head part of the pedestrian; a gait point-in-time detecting step of setting a gait point-in-time by extracting a peak value in the acceleration in the vertical direction within a gait cycle including a standing phase and a swing phase and detecting a start point and an end point of a double-limb support on the basis of the peak value; and a gait parameter detecting step of detecting the double-limb support on the basis of the start point and the end point in order to analyze a gait posture of the pedestrian, wherein the start point and the end point of the double-limb support are set within a window predetermined on the basis of peaks of the gait cycle, the start point of the double-limb support is the same as an end point of a single-limb support, and the end point of the double-limb support is the same as a start point of a single-limb support characterized in that in the gait point-in-time detecting step, a gait jerk signal at a point-in-time in which an impact is applied to a ground when a limb moves from the single-limb support to the double-limb support is further detected by differentiating the acceleration in the vertical direction, and a peak value of the gait jerk signal located before the peak value of the acceleration in the vertical direction is set as the start point of the double-limb support, and a peak value of the gait jerk signal located after the peak value of the acceleration in the vertical direction is set as the end point of the double-limb support.