To provide a vibrationproof construction method capable of providing high vibration shutting off effect in a banking part for a railroad and a road.

A vibrationproof block 6 is obliquely provided by tilting it in the direction of depth in a banking of a banking part 1 for a railroad and a road. In this case, a pair of vibrationproof blocks 6, 6 are provided with intervals from each other in such a way that an upper interval A is larger than a lower interval B in the crossing direction of the banking part 1. Moreover, the vibrationproof blocks 6 are a plurality of highly rigid ground improving piles formed like a column row by grouting chemical liquid from shoulder parts 1a, 1b of the banking part 1.