To make it possible to simply form a latticed slope protection frame according to the standardized measurement without requiring any skill and to enable the great increase of the strength of the frame in addition to accomplishing surely the positioning of reinforcing bars in that time.

A net body 1 is provided with the specific height H and width W, and it is so bent or curved that it becomes the approximately same shape in the direction of the depth. A groove section 10a longer in the direction of the depth is formed on the net body, and reinforcing bars 5 arranged in the shape of a lattice are so arranged on a net-like body 4 spread on a slope 3 that they are fitted into the groove section 10a, and mortar 6 is sprayed on the reinforcing bars 5 to use it as a standard of sprayed thickness of the mortar 6 when a latticed slope frame 2 is formed.