Abstract: A calculating unit of a swing analyzer calculates, assuming that a golf club is in a uniform circular motion about a virtual center of rotation O during a swing, a virtual speed Vh at a central point R of a golf club head, based on a distance between first and second acceleration sensors, a distance between the first acceleration sensor and the central point R of a golf club head and outputs from the first and second acceleration sensors, and calculates the speed of central point R of a golf club head utilizing the virtual speed Vh.

Abstract: A measuring device includes a strain gauge, a processing unit calculating an expected bending point value corresponding to a bending point position, and a display unit capable of displaying an output value from the processing unit. The processing unit calculates the expected bending point value based on a measured value of strain gauge at a first time point during a swing of the user and a measured value of strain gauge at a second time point closer to an impact time point than the first time point. The processing unit stores in advance conversion data for converting the expected bending point value to recommended kick point output value indicating kick point, and the processing unit outputs the recommended kick point output value corresponding to the calculated expected bending point value to the display unit.

Abstract: A measuring device includes a strain gauge, a processing unit calculating an expected bending point value corresponding to a bending point position, and a display unit capable of displaying an output value from the processing unit. The processing unit calculates the expected bending point value based on a measured value of strain gauge at a first time point during a swing of the user and a measured value of strain gauge at a second time point closer to an impact time point than the first time point. The processing unit stores in advance conversion data for converting the expected bending point value to recommended kick point output value indicating kick point, and the processing unit outputs the recommended kick point output value corresponding to the calculated expected bending point value to the display unit.

Abstract: A calculating unit of a swing analyzer calculates, assuming that a golf club is in a uniform circular motion about a virtual center of rotation 0 during a swing, a virtual speed Vh at a central point R of a golf club head, based on a distance between first and second acceleration sensors, a distance between the first acceleration sensor and the central point R of a golf club head and outputs from the first and second acceleration sensors, and calculates the speed of central point R of a golf club head utilizing the virtual speed Vh.