Patent ID: 8287713

Claim:
A method of producing a body having a flow path formed therein, comprising: providing a flow path-forming portion in a base material which is dissolvable in an arbitrary aqueous solution; electroplating for a first time on a surface of the base material, where the flow path-forming portion has been formed, with a material which is not dissolvable in the aqueous solution, thereby forming a first thick plating layer; removing the base material from the first thick plating layer, while leaving the flow path-forming portion intact, in a composite comprising the base material and the first thick plating layer; electroplating for a second time on a surface of the first thick plating layer, where the flow path-forming portion has been disposed, with a material which is not dissolvable in the aqueous solution, to form a second thick plating layer, thereby surrounding the flow path-forming portion with a plurality of thick plating layers; forming an inlet hole and an outlet hole, which communicate with a surface of the flow path-forming portion, in a surface of the plurality of thick plating layers; and flowing the aqueous solution through the inlet hole and/or the outlet hole to dissolve the flow path-forming portion with the aqueous solution, thereby forming the flow path for a fluid, which has a shape corresponding to the flow path-forming portion, inwardly of the plurality of thick plating layers.