The present invention relates to a magnetic sensor and a magnetic detecting method. A first arrangement pattern includes: a first magnetic detection unit (201) including a magnetic sensitivity material (201a) and a magnetic convergence material (201b) having a length different from a length of the magnetic sensitivity unit on a substrate, and being arranged to be parallel to the substrate and arranged horizontally so that a median line (Ma) passing through a midpoint of the magnetic sensitivity material in a longitudinal direction and a median line (Mb) of the magnetic convergence material in the longitudinal direction do not cross with each other; a second magnetic detection unit (202) having the structure same as the structure of the first magnetic detection unit; and a connecting unit electrically connecting the magnetic sensitivity material of the first magnetic detection unit in series with a magnetic sensitivity material of the second magnetic detection unit.