An unmanned aerial vehicle (UAV) is provided. The UAV includes a first guard grill, a second guard grill configured to be removably combined with the first guard grill and form an external structure and an inner space of the UAV with the first guard grill, a housing configured to include a central portion located in the center of the inner space and embed a processor and a navigation system, one or more propelling elements configured to be located the inner space and be disposed around the central portion, and a plurality of motor assemblies configured to be located in the inner space and drive the propelling elements while being electrically connected with the processor. When viewed from the outside of the external structure, the propelling elements are partially covered by at least one of the first guard grill or the second guard grill.