A synthetic polymer film (34A) having a surface which has a plurality of raised portions (34Ap), (34Bp), wherein a two-dimensional size of the plurality of raised portions (34Ap), (34Bp) is in a range of more than 20 nm and less than 500 nm when viewed in a normal direction of the synthetic polymer film (34A), (34B), the surface having a microbicidal effect. The synthetic polymer film (34A), (34B) includes a urethane resin and a silicone oil, and the silicone oil has a HLB value of not less than 14 and not more than 18.
