The present invention relates to a binding molecule capable of specifically binding to Lrig-1 protein, which is on the surface of regulatory T cells. The binding molecule provided in the present invention can suppress the function of regulatory T cells to effectively prevent, ameliorate, or treat cancer, particularly solid tumor. The binding molecule has advantages of more effectively targeting the Lrig-1 protein as compared with antibodies against Lrig-1 which are previously commercially available, and also possessing very good binding capacity thereto.
