[ Problems ] In use , the captured small animal , can be accommodated by opening and closing the upper surface material, and bent to shape to go inward when not used , to provide a small animal storage box which can be folded . A bottom member 1a, left side member 1b, the right side member 1c, the upper surface comprising a front material 1d and rear material 1e is formed in a rectangular box shape opening , folding the top surface material . 1f that is formed on the upper edge formed a curved portion G can be opened and closed swing to the horizontal position from a vertical position as a fulcrum , the sides and the opening edge 2b~2d and a removable lockable fastening member 3 of the top surface material is provided, and inside the upper surface material the I will be providedpossible inspection window section 4 . Also , the upper part of the left side member and the right side member , the lower and the middle part , a horizontal fold line portion M which can be folded by bending the shape of going toward inward are formed . [ Selection Figure Figure 2【課題】使用時には、捕獲された小動物を、上面材の開閉により収容でき、不使用時には内方に向けてく字状に折曲し、折り畳むことができる小動物収容箱を提供する。【解決手段】底面材1a、左側面材1b、右側面材1c、前面材1d及び後面材1eからなる上面が開口する四角箱状に形成され、上面材1fは上縁部に形成された折曲線部Gを支点として垂直位置から水平位置へと開閉揺動可能に形成され、上面材の辺部と開口縁部2b~2dとを着脱固定可能な止着部材3を設け、上面材に内部を覗見可能な覗窓部4を設けてなる。また、左側面材と右側面材の上部、下部、及び中程部に、内方へ向けてくの字状に折曲して折りたたむことができる水平折曲線部Mが形成されている。【選択図】図2