The present invention addresses the problem of providing a cyclic olefin polymer having good heat resistance reliability, soldering heat resistance, and adhesion to a metal foil. The present invention provides a cyclic olefin polymer which is an addition polymer of a cyclic olefin monomer and an α-olefin, wherein the content of structural units derived from the α-olefin with respect to all structural units of the cyclic olefin polymer is more than 0 mol% and less than 35 mol%, the content of double bonds in 1000 structural units in the addition polymer is 0.50 to 1.60% inclusive, and the ratio of the content of terminal vinylidene groups in the double bond content is 10 to 50% inclusive.
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