To provide a small animal invasion preventing structure capable of reliably preventing various types of small animals from entering a power plant, a substation or the like.SOLUTION: The small animal invasion prevention structure includes an enclosure 2 in which at least a part of the outer surface is constituted by an undulating planar body 3 having a fine undulation consisting of a smooth surface and a gentle curved surface. The undulating planar body 3 is a mesh body formed of a plurality of wire rods having a circular cross section and a smooth surface, and the mesh body has a wire diameter of 0.5 to 2.5 mm And the eye opening is 8 mm or less. The undulating planar body 3 is fixed to the enclosing struts 21 A and 21 B and the outer side faces of the crosspieces, and the securing part of the undulating planar body 3 has a corner portion of 90 or less in the portion constituting the outer surface of the enclosure 2 And is covered with a covering member 23 in the form of a substantially band plate which does not have the above-mentioned shape.(FIG.【課題】多様な種類の小動物が発電所や変電所等に侵入するのを確実に防止しうる小動物侵入防止構造を提供する。【解決手段】小動物侵入防止構造は、表面が滑らかでかつ緩やかな曲面からなる微細な起伏を有する起伏面状体3によって外表面の少なくとも一部が構成されている囲い2を備えている。起伏面状体3が、円形の横断面を有しかつ表面が平滑な複数の線材から形成された網状体であり、網状体は、その線材の太さが0.5~2.5mmであるとともに目開きが8mm以下である。起伏面状体3は、囲いの支柱21A、21Bおよび桟の外側面に固定されており、起伏面状体3の固定部が、囲い2の外表面を構成する部分に90°以下の角部を有していない略帯板状の被覆部材23で覆われている。【選択図】図2
