The invention relates to a magnetic field sensor (100) that comprises at least : a body (108) including magnetic means (112) capable of forming a torque applied onto the body by an external magnetic field to be detected; connection means (116) separate from the body for mechanically connecting the body to an inlay portion (114) of the sensor by at least one pivot link having an axis perpendicular to the direction of the magnetic field to be detected; means for detecting a stress applied onto the body by the torque, separate from the connection means and including at least one suspended stress gauge (124) having a first portion (123) mechanically connected to the inlay portion and a second portion (125) mechanically connected to the body, as well as a third portion (127) provided between the first and second portions and suspended between the inlay portion and the body.