Catalyst for the production of olefin polymers

(57) -- A summary following formula: (A has following formula: each here -- M -- the -- it being the metal chosen from the group which consists of a 3*13 fellows element and a lanthanide series element, and) L is 1 value, 2 values, or a 3 value anion each, and X and Y are hetero atoms, respectively, Cyclo is a ring type portion -- each R -- respectively -- the hydrogen and -- it being a basis containing 1*50 atoms chosen from the group which consists of a 13*17 fellows element, and, Two or more adjoining R bases can also form a ring type portion unitedly, each R -- respectively -- the hydrogen and -- it being a basis containing 1*50 atoms chosen from the group which consists of a 13*17 fellows element, and, Two or more adjoining R bases can also form a ring type portion unitedly, m is an integer of 0*5 each, respectively, n is an integer of 1*4, Q is a mediation machine, q is 1 or 2, and when q is 2, the catalyst precursor with which the basis A can also be optionally connected by the mediation machine Z is offered. This catalyst precursor can be manufactured by making an organic metallic compound and a hetero atom content ligand react. This catalyst precursor is useful because of olefin polymerization, when combined with the co-catalyst for activation.