To achieve a high light transmission property at an ultraviolet region by achieving a macromolecular chain expressed by a specific equation and constituting a microchip with a polymer that satisfies specific required conditions.

A polymer is provided with a macromolecular chain that is expressed by an equation I. In this case, A-D indicate the monomer unit in macromolecular main chain configuration and a-d indicate wt.%, and the total is equal to 100 (50≤a≤100 and 0≤b-d<50). Also, A, B, C, and D are monomer units being selected from 1,3-cyclohexadiene monomer expressed by an expression II (R': hydrogen atom each independently, C1-C20: alkyl group, C5-C20: non- saturated fat hydrocarbon group and aryl group, C3-C20: cycloalkyl group, C4-C20: cyclodienyl group), a chain-shaped conjugate diene monomer body, vinylcyclohexane monomer body, and ethylene and α-olefin, respectively. Further, the hydrogen addition rate of carbon - carbon double combination existing in the monomer body units A and B is set to 90% or higher, a number-average molecular weight is set to 104-5×106, and the light transmission rate minimum value in an ultraviolet region where a light wavelength region ranges from 230-400 nm is set to 50% or higher.