A wearable smart device have a display, a body configured to support the display by having a prescribed curvature to be worn on a user body of a user, a band configured to be detachably coupled with the body by having a prescribed curvature, a first connector configured to couple a first end portion of the band to the body, the first connector configured to separate the first end portion of the band from the body, and a second connector configured to couple a second end portion of the band opposing the first end portion to the body, the second connector configured to separate the second end portion of the band opposing the first end portion from the body. A first direction for separating the band from the body in the first connector is different from a second direction for separating the band from the body in the second connector.