A flat-plate heat pipe structure includes a main body. The main body has a first board body, a second board body, a first capillary structure and a working fluid. The first and second board bodies are overlapped and mated with each other. The first capillary structure is disposed between the first and second board bodies. The first capillary structure and the first and second board bodies together define at least one vapor passage. Accordingly, when the flat-plate heat pipe is thinned, the flat-plate heat pipe still keeps having a vapor passage, whereby the vapor-liquid circulation efficiency of the flat-plate heat pipe will not be deteriorated due to thinning.
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