The fitting method includes a step of preparing a relationship C in which a face angle at or before impact and a hitting result are considered when a plurality of golf players swing using a plurality of golf clubs with different head physical property values; a step of obtaining measurement result of the face angle by a subject (golf player) hitting a ball with a test club; and a step of determining a head physical property fitted to the subject on the basis of the relationship C and the measurement result of the face angle. Preferably, the relationship C is a relational expression F1. The relational expression F1 may be a relational expression F11 of the face angle and the hitting results. The relational expression F1 may be a relational expression F12 of the face angle and the head physical properties.