Disclosed are anti-BCMA heavy chain only antibodies (UniAbs), as well as methods of making such antibodies, compositions including pharmaceutical compositions containing such antibodies, and B characterized by the expression of BCMA. Disclosed are their uses for treating cellular disorders.抗BCMA重鎖のみ抗体(UniAb)を開示し、併せて、そのような抗体を作製する方法、そのような抗体を含む薬学的組成物を含めた組成物、及びBCMAの発現を特徴とするB細胞障害を治療するためのそれらの用途を開示する。