To provide a tension balancer for an overhead wire, which can suppress external scattering of oil caused by a lubricant oil inside while using a drainage structure.

A tension balancer 100 for an overhead wire, which supports an installed overhead wire applying tension thereto, collects rain water accumulated inside from a collector pipe connecting section 209 into a collector tank 211 via a collector pipe 207. In this way, even if an oil content of grease applied inside the tension balancer 100 for an overhead wire is fluidized together with rain water, external scattering of the oil content can be prevented.