Abstract: A biaxial flux gate type magnetic sensor has a core which is made of a magnetic thin film in the shape of a loop, patterned upper and lower electrically conductive thin-film layers respectively above and below this core each with an insulating layer in between, and electrically conductive connecting members each extending between and electrically connecting these upper and lower electrically conductive layers. These upper and lower electrically conductive layers are patterned and the contact portions connect them such that they together provide an excitation coil and four detection coils. These coils are each formed so as to be wound helically and uniformly around and along a circumferential direction of the loop-shaped core by passing both inside and outside the loop. The loop is of a shape which is symmetrical with respect to two mutually perpendicular directions and is divided into four mutually symmetric sections.