POSITION DETECTION APPARATUS

A Halbach array is formed from first to third magnets (28a to 28c) provided to a rotor (16). Of shortest straight-line distances (clearance distances) between the first to third magnets (28a to 28c) and a Hall element (30) as facing the first to third magnets (28a to 28c) after moving relative to the first to third magnets (28a to 28c), the shortest straight-line distance between the second magnet (28b) and the Hall element (30) is set the longest. In other words, the second magnet (28b) is placed at a position offset from the first magnet (28a). This arrangement enhances linear responsiveness of a position detection apparatus. In addition, the second magnet (28b) may be offset from the third magnet (28c).