The present invention relates to: a bispecific antibody including an antigen-binding domain that binds to TRAILR2 and an antigen-binding domain that binds to PSMA, or a fragment of said antibody a nucleic acid including a base sequence that encodes said antibody or said antibody fragment a recombinant vector including said nucleic acid a transformant strain including said recombinant vector a method for producing said bispecific antibody or said antibody fragment by using said transformant strain and a detection/measurement reagent, a diagnostic drug, and a therapeutic drug including said bispecific antibody or said antibody fragment.本發明係關於包含與TRAILR2結合之抗原結合區域及與PSMA結合之抗原結合區域的雙專一性抗體或該抗體片段、具有編碼該抗體或該抗體片段之鹼基序列的核酸、包含該核酸之重組載體、包含該重組載體之轉形株、使用該轉形株之該雙專一性抗體或該抗體片段之製造方法、以及包含該雙專一性抗體或該抗體片段之檢測或測定試劑、診斷藥及治療藥。
