Novel phosphorus transition metal complexes that has excellent anti-cancer property is disclosed. The phosphorus transition metal complexes is represented by the general formula (1) as shown in the patent application where A is an alkylene group, phenylene group or cis-ethylene group； M represents Au, Ag, Cu or Pt atom； B1 and B2 respectively represent a heterocyclic group comprising trivalent phosphorus atom and substituted group, which is covalent bonded with A and coordination bonded with M； C is an anion.提供具有優異抗癌性之新穎的膦過渡金屬錯合物。；係以下述通式(1)；(1)；(式中，A表示伸烷基、伸苯基或順式伸乙烯基，M表示金、銀、銅或鉑原子，B1及B2各表示與A為共價鍵且能與M配位鍵結的雜環基，其包含3價磷原子及取代基，C表示陰離子原子)表示之膦過渡金屬錯合物。
