The present invention provides a water-cooled heat sink having an integrated structure, and having inside a precise, freely formed flow path, the water-cooled heat sink being produced without using a technique for pasting a plurality of metal sheets. In a water-cooled heat sink 1, a formed body 2 is provided outwardly, a flow path 3 for passage of a liquid is formed inwardly of the formed body 2, and an inlet 5 and an outlet 4 for the liquid, which communicate with the flow path 3, are formed in the main body of the heat sink 1. The entire formed body 2 of the heat sink 1 is integrally formed by thick coating layers applied by electroplating, and has no joints.
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