Provided are a thin film transistor for display devices and a manufacturing method of the thin film transistor. The thin film transistor for display devices includes: a flexible substrate; a gate electrode layer formed on the flexible substrate; a first insulating layer formed on the flexible substrate and the gate electrode; a source and a drain formed on the first insulating layer; an active layer formed on the first insulating layer between the source and the drain; a second insulating layer formed on the first insulating layer, the source, the drain, and the active layer; and a drain electrode that opens the second insulating layer to be connected to the drain and is formed of a CNT dispersed conductive polymer.