An apparatus for attaching an interconnector of a solar cell panel, includes an interconnector supply unit for unwinding the interconnector wound around a winding roll and moving the interconnector in a processing direction; and an attachment unit for attaching the interconnector to a solar cell, wherein the interconnector supply unit includes the winding roll, around which the interconnector is wound; and an unwinding control member for unwinding the interconnector from the winding roll, and wherein the unwinding control member allows the interconnector to be unwound so as to pass through one end of the winding roll in a longitudinal direction.