PROBLEM TO BE SOLVED: To provide a new steroidal compound useful as a medicine for diagnosis and a medicine comprising the same.SOLUTION: The present invention provides a steroidal compound represented by formula (1) (where Ris a hydroxy group, a protecting hydroxy group, a halogen atom, a radioisotope or a radioisotope-containing group, Rand Rare the same or different and represent a hydrogen atom or a protecting group of a hydroxy group, and n is an integer of 1-5).SELECTED DRAWING: None【課題】診断用医薬として有用な新たなステロイド化合物及びこれを含有する医薬の提供。【解決手段】式(1)(式中、R1はヒドロキシ基、保護ヒドロキシ基、ハロゲン原子、放射性同位元素又は放射性同位元素含有基を示し、R2及びR3は同一又は異なって水素原子又はヒドロキシ基の保護基を示し、nは1~5の整数を示す)で表されるステロイド化合物。【選択図】なし