The present invention relates to [1] a concavo-convex plate for an electrospinning method, in which a surface resistivity of the concavo-convex plate is not more than 1×10−2Ω/□, and the concavo-convex plate has an uneven structure on at least a part of a surface thereof, and [2] a process for producing a nonwoven fabric containing nanofibers by an electrospinning method using the concavo-convex plate for an electrospinning method according to the aforementioned [1] as a collector, which includes the step of depositing the nanofibers on a surface of the concavo-convex plate on which the uneven structure is formed.