The present invention relates to an antibody that binds to GARP and is useful as a therapeutic agent against tumors and a method for treating a tumor using the antibody. The present invention addresses the problem of providing an antibody which can be used as a medicine that inhibits the function of Treg in a tumor and thus exhibits a therapeutic effect and a method for treating a tumor using the antibody. An anti GARP antibody that binds to GARP and exhibits a Treg function inhibiting activity and an ADCC activity is obtained. Moreover a medicinal composition for treating tumors said composition containing the antibody is obtained.
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