Abstract: Disclosed herein is a device for jointing poles of a tent. The device has a housing and a rotor body. In this case, the housing consists of a first pole insert hole for receiving a pole, a seat slit in which the rotor body is seated, and a locking recess formed on each sidewall of the seat slit. The rotor body consists of a longitudinal hinge hole receiving a hinge pin therein such that the rotor body seated in the seat slit of the housing is rotatably jointed to the housing. A locking lug is inserted into an associated locking recess of the housing to limit rotation of the rotor body. A second pole insert hole receives another pole. Furthermore, the device includes a unit for automatically releasing the rotor body from the housing. The automatic releasing unit consists of an elastic member mounted by a locking member to an end wall provided at the inside end of the seat slit.