This disclosure relates to a connection device that can provide a new function for an electronic device. A film antenna receives a wireless signal transmitted by radio, a relay unit relays the received wireless signal to a television receiver, an LED indicator emits light based on a control signal transmitted from the television receiver, a storage case stores the film antenna, the relay unit and a light emitting unit, and a connection member connects the storage case to the television receiver. In addition, in a state of being connected to the television receiver, in a normal direction to a housing surface having a display unit on a housing of the television receiver, the storage case has a protruding section which further protrudes from the housing surface and stores the film antenna in the protruding section. For example, this disclosure can be applied to a receiving device having a receiving unit which receives the wireless signal.