To provide a seat front-to-rear movement prevention device attached to a hydraulic shock buffer since the safety measures for person are required much more and a part of lifesaving role should be taken, although a seat belt and an airbag are used as safety measures because a car accident occurs daily and sacrifices a precious life by occurrence of a large number of injured person and deceased person.

In the seat front-to-rear movement prevention device, an R-shaped stopper is installed between an upper part of the upper seat moving support board and a lower part of the upper seat moving support board, and the top-to-bottom support board is fixed with two different shape bolts, and at the same time a prevention hole of a rolling seat is opened, and the top-to-bottom support board is set to the prevention hole of the rolling seat with two bolts and fixed to the lower part of the bolt with the nut.