A cooling device includes a flow-path substrate, an intermediate substrate, and a lid-substrate each made of a polyimide resin, and a condenser substrate incorporated into holes of the intermediate substrate and an evaporator substrate which are made of a metal having a high thermal conductivity, whereby heat from a heat source can be enclosed into the evaporator substrate and the condenser substrate, so that the quantity of the latent heat can be substantially increased.

 
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