Magnetic sensor and its manufacturing method

A magnetic sensor comprising:

• a substrate;
• a sensor chip including an element formation surface having a magnetosensitive element formed thereon, the sensor chip being mounted on a surface of the substrate such that the element formation surface is perpendicular to the surface of the substrate;
• and
• a magnetism collecting member having a first surface and a second surface, the magnetism collecting member being mounted on the surface of the substrate such that the first surface of the magnetism collecting member faces the surface of the substrate and the second surface of the magnetism collecting member faces the element formation surface of the sensor chip,
• wherein the magnetism collecting member has a third surface opposite the first surface,
• wherein the sensor chip and the magnetism collecting member are fixed to each other through an adhesive applied on the sensor chip and the third surface of the magnetism collecting member, and
• wherein the first and second surfaces of the magnetism collecting member have flatness higher than that of the third surface of the magnetism collecting member.