PROBLEM TO BE SOLVED: To provide a phosphine transition metal complex excellent in solubility in an aqueous solvent and having higher anticancer activity than conventional cisplatin, an anticancer agent using the same, and a method for producing a phosphine transition metal complex. A phosphine transition metal complex represented by the formula (1). (In the formula, R1 to R4 and R6 to R9 are alkyl groups, cycloalkyl groups, adamantyl groups, R5 and R10 are monovalent substituents, n and y are integers of 0 to 4, and M is gold, copper, or silver. Represents a selected transition metal atom.) [Selection diagram] None【課題】水系溶媒に対して溶解性に優れ、従来のシスプラチンよりも抗がん活性が高いホスフィン遷移金属錯体及びそれを用いた抗がん剤並びにホスフィン遷移金属錯体の製造方法を提供する。【解決手段】式(1)で表されるホスフィン遷移金属錯体。(式中、R1~R4及びR6~R9はアルキル基、シクロアルキル基、アダマンチル基、R5及びR10は一価の置換基、n及びyは0~4の整数、Mは金、銅、銀から選ばれる遷移金属原子を表す。)【選択図】なし