An animal trap for capturing a small-weight animal. The animal trap includes a capturing enclosure 12 provided with a first entrance 11, a swing plate 13, provided in an approach 15 of an animal entered from the first entrance 11, for plugging up the first entrance 11 by swinging forward, and a locking mechanism 14 for temporarily locking the swing plate 13 so that the swing plate 13 swung to plug up the first entrance 11 does not swing back. The temporary locking mechanism 14 includes a first lock part 21A and a second lock part 21B that are disposed in a front end part of the swing plate 13. The lock parts are constructed to have mutually different heights at which the swing plate 13 is temporarily locked. When an animal enters, the swing plate 13 swings to plug up the first entrance 11, and it is temporarily locked. The swing plate 13 can be swung by a small weight.
