The present invention provides a nest box, comprising: an upper box body having an upper end and a lower end, the upper end having a width greater than a width of the lower end, wherein the upper end is a plate body and the lower end is an opening； and the lower case body has a corresponding The second opening has an opening larger than the other opening； wherein the upper case is coupled to the lower case such that the larger opening of the lower case communicates with the opening of the upper case. The nest box of the creation has the advantages of normalization and mass production, and can be effectively fixed on the trunk and can avoid moisture and sultry.本創作提供一種巢箱，包括：上箱體，具有上端及下端，該上端之寬度大於該下端之寬度，且該上端為板體而該下端為開孔；以及下箱體，具有相對應之二開口，且其一開口大於另一開口；其中，該上箱體與該下箱體耦接，以使該下箱體中該開口較大者與該上箱體之該開孔連通。本創作之巢箱具備規格化、可量產之優點，且能有效固定於樹幹上並可避免潮濕悶熱。
