To provide a rattrap box which unnecessitates putting baits in a trick basket and killing a captured rat for disposing of it, eliminates the uncertainty of tapping because of depending on only the tacky powder of a tacky adhesive agent, avoids the rat from looking out the trap and attains its settlement without looking at the disgusting appearance of the captured rat.

An aisle port 2 of a size allowing only a rat to enter through is formed at an optional position at the upper part of the side surface of the box to insert an internal box made of oilproof paper or a polyethylene bag in this box. Then a proper amount of the mixture of rosin and sesame oil into polybutene having the average molecular weight of 300 to 2,000 units is included in the internal box or bag.