The invention relates to new bispecific antigen binding molecules, comprising at least one antigen binding domain capable of specific binding to 4-1BB, at least one moiety capable of specific binding to a target cell antigen, and a Fc domain composed of a first and a second subunit capable of stable association, and to methods of producing these molecules and to methods of using the same.本發明係關於新的雙特異性抗原結合分子,其包含至少一個能夠特異性結合於4-1BB之抗原結合結構域、至少一個能夠特異性結合於靶細胞抗原之部分、及由能夠穩定結合之第一及第二亞單元組成的Fc結構域,且關於產生此等分子之方法及其使用方法。