Provided are a behaviour measurement method and a behaviour measurement device capable of accurately measuring the behaviour of a golf club head or batting implement while preserving a simplified structure. A transmitter (12), a golf-club-side 3D magnetic sensor (14), and a supporting-means-side 3D magnetic sensor (16) are used to generate behavioural data expressing the behaviour of a golf club head (4). The transmitter (12) is disposed in a predetermined position and generates a magnetic field having a known distribution with respect to strength and direction. The golf-club-side 3D magnetic sensor (14) is mounted on a golf club (2) and has a first measurement point (1402) and a first measurement direction (1404). The supporting-means-side 3D magnetic sensor (16) is integrally supported by a supporting means (20), and has a second measurement point (1602) and a second measurement direction (1604). The supporting means (20) supports the golf club (2) such that a set lie angle and loft angle are achieved.
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