To provide a capturing device obtaining a stable capturing rate by avoiding requesting action conflicting the animals' habit of being afraid of entering the deepest place of a closed cage and mostly stepping over a projecting step board, etc.

Doors 1 are provided in both entrance directions of the animal capturing device, a floor plate 6 itself is made a freely tilted seesaw mechanism and a device to be installed inside the cage is limited to only wires 4 and 5. Then the tilting of the floor plate 6 generated by an animal intruding from an optional direction disengages one side of a spindle 7 supporting a door 1. In addition, the tilting of the plate 6 generated again at the point of the time when the animal goes to an entrance on the opposite side from the center part of the cage disengages the other side of a spindle supporting the door and both doors 1 is simultaneously closed at the moment.