Disclosed is a wearable smart device which a user can conveniently and comfortably wear. The present application may provide a wearable smart device comprising: a flexible display unit; a first frame which supports the flexible display unit and is restorably deformed to have a first curvature to allow the wearable smart device to be worn on a user's body; and a second frame which is restorably deformed to have a second curvature larger than the first curvature and is movably coupled to the first frame to allow the second frame to move relatively with the respect to the first frame while the second frame is deformed, wherein the second frame is configured to adjust the amount of deformation of the wearable smart device.