To provide a sheet which plays the role of a thermal insulating layer from terrestrial heat when laid on a road ground surface so as to be efficiently laden with snow by partially joining a sheet-like material made of a water permeable synthetic resin and a non-woven fabric made of a synthetic resin having prescribed void volume to form a laminate and specifying the thickness over the entire part thereof to a prescribed size.

This snow retaining mat 1 for laying in a skiing ground consists of the two-layered structure composed the non-woven fabric 3 and the sheet-like material 2 and is used by laying the sheet on the base ground of the skiing ground by positioning the non-woven fabric 3 as a front side and the surface of the sheet-like material 2 as a rear side. The layer by the non-woven fabric 3 acts to maintain the temp. of the front layer of the non-woven fabric 3 on the front layer like the outdoor air temp. by insulating the terrestrial heat. The layer consisting of the sheet-like material 2 reinforces the non-woven fabric 3 and assures water passage holes 5 which are the routes to permeate and absorb the water melting from the snow to the ground surface. The sheet-like material 2 made of such water permeable synthetic resin and the non-woven fabric 3 made of the synthetic resin fibers having the void volume of 20 to 200kg/m2 are partially joined to form the laminate and the thickness over the entire part thereof is specified to 2 to 10mm.