A base protective layer, a bottom shielding layer, and a bottom insulating layer 4 are formed in turn on a base made of AlTiC. Then, a magnetoresistive effective film is formed on the bottom insulating layer, and a magnetic biasing layer is formed so as to be contacted with both side surfaces of the magnetoresistive effective film which are parallel to the ABS thereof. Then, electrode layers are formed so as to be contacted with the rear surface of the magnetoresistive effective film opposite to the ABS thereof.