An accessory includes a main body that includes a communication module that is configured to communicate with a predetermined network, and a container including a main body-coupling portion that is located at an upper portion of the container and configured to separably couple to the main body, the container being made of a material that is able to be injection-molded. The container includes an outer portion that is exposed to an outside of the container based on the main body being coupled to the container, and an inner portion that is recessed downward to thereby define the main body-coupling portion, the inner portion including a bottom portion that defines a bottom surface of the inner portion, and an inclined portion that extends upward from a circumference of the bottom surface and outward with respect to a central axis passing through the container in a vertical direction.