Patent ID: 6872579

Claim:
A method of forming a thin-film coil containing stacked sublayers whose number is M where M is an integer that is two or greater, the method comprising the steps of forming the respective sublayers by frame plating from a first sublayer to an M th sublayer one by one, each sublayer being spiral shaped, each of the steps including: the step of forming a coating film by applying a liquid resist to a layer below; the heat processing step of forming a resist layer by performing heat processing on the coating film; the step of forming a frame having a groove by patterning the resist layer; and the plating step of forming each of the sublayers by plating through the use of the frame, wherein, in the plating step of the step of forming an N th sublayer where N is an integer that is one or greater, and is (M−1) or smaller, the sublayer is formed to include: a first portion having a sidewall and encased in the groove; and a second portion extending out of the groove and coupled to the first portion, the second portion having overhang portions that overhang and extend more outward than the sidewall of the first portion.