To obtain a highly durable net by jointing a reinforcing triangular net formed to a specific shape to any reinforcement position of a net to ensure the position to be reinforced.

This net is obtained by jointing, through e.g. sewing, a reinforcing triangular net 1 formed to an approximately triangular shape by winding a relevant member 2 such as a thread or rope around a specified bundled part of quadrangular or square reinforcing net 1a, to reinforcement position(s) such as the planar and/or edge part(s) of a net 3; wherein it is preferable that the above reinforcement position(s) is provided with one or more reinforcing materials among threads, ropes, abutting nets and the like.