The present invention relates to a recess support structure of a trolley rail support having a breaking wave function. A trolley rail support is installed on an internal circumference of a moon pool. A trolley rail is installed in the trolley rail support. The trolley rail support is formed to have a structure to break a wave flowing into the moon pool. As the trolley rail support in an internal circumference of the moon pool is formed in a recess type, a height of a top side module installed to be high along a height of a trolley can be lowered for the center of gravity of a ship to be lowered to increase balance safety of a ship, and further, the trolley rail support is formed in a breaking wave structure to promote safety of drilling operation.;COPYRIGHT KIPO 2015
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