PROBLEM TO BE SOLVED: To reduce a change of an active position on gap fluctuation between a magnetic field detecting part and a magnetic field generating part of a magnetic proximity switch.
SOLUTION: The magnetic field generating part 12 comprises a plate shaped magnetic metal body 13d, three permanent magnets 13a, 13b, 13c having a same shape and material and attracted by the magnetic metal body 13d. The three permanent magnets 13a-13c are arranged in parallel at an equal interval along a sliding direction of the magnetic field generating part 12 so that a pole face of an equal pole (an S pole) are going to face to the magnetic field detecting part 11. An isodynamic line linking points having a same gap directional component of magnetic force generated by the respective permanent magnets 13a-13c makes a curved line with a small change in the active position on the fluctuation of the gap direction on both sides.
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