本发明系一种新颖之乙烯．α-烯烃．非共轭多烯共聚合体，其具有源自乙烯(A)、碳原子数3~20之α-烯烃(B)、及分子中含有合计2个以上选自由下述通式(I)及(II)所组成之群组中之部分构造之非共轭多烯(C)的构成单位，且长链分支较少。 根据本发明，可提供一种含有VNB等非共轭多烯作为共聚合成分、且长链分支含量较少、于使用过氧化物进行交联之情形时硬化特性优异的新颖之乙烯．α-烯烃．非共轭多烯共聚合体，又，可提供该乙烯．α-烯烃．非共轭多烯共聚合体之制造方法及用途。

Provided is a novel ethylene/[alpha]-olefin/non-conjugated polyene copolymer that has few long-chain branches and that comprises a constituent unit that is derived from: ethylene (A); an [alpha]-olefin (B) that has 3-20 carbon atoms; and a non-conjugated polyene (C) that contains a total of two or more partial structures that are selected from the group consisting of formulas (I) and (II) in a molecule thereof. The present invention makes it possible to provide a novel ethylene/[alpha]-olefin/non-conjugated polyene copolymer that contains a non-conjugated polyene such as VNB as a copolymer component, that contains few long-chain branches, and that has excellent curing characteristics when cross-linking is performed using a peroxide. The present invention also makes it possible to provide a production method for the ethylene/[alpha]-olefin/non-conjugated polyene copolymer and a use therefor.