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The occurrence of marine debris on seagrass beds will be through fragmentation into small particles called microplastics (MPs). Sea urchins (Echinoidea) is one of the associated organisms on seagrass beds which can accumulate microplastics by mode of its feeding habits. This research was conducted from October-December 2018 in Barranglompo Island and aimed to know the abundance and characteristics of microplastics that accumulates in sea urchins (Tripneustes gratilla), seagrass leaf, and sediment. Sampling location was conducted at the area where T. gratilla were found. A sampling of sea urchins was taken in multispecies seagrass (Enhalus acoroides and Thalassia hemprichii). MPs in sea urchins, seagrass leaf and sediment were identified by visual identification method using a stereo microscope. The results showed that all samples of sea urchins (n=10), seagrass leaf (n=24), and sediment (n=8) were 100% contaminated by MPs. The average abundance of microplastics in sea urchins T. gratilla was 27.60±5.31 MPs/individual; in seagrass leaf E. acoroides and T. hemprichii in the T. gratilla sampling area were 0.15±0.03 MPs/cm2 dan 0.23±0.04 MPs/cm2, respectively; in sediment of T. gratilla sampling area was 152.50±29.38 MPs/kg. The characteristics of MPs were found to show similarities such as color (dominated by blue) and form (dominated by line).