A ventilation cap according to the present disclosure includes a body, a ventilation filter, a cover member, and legs. A first vent hole is defined in the body, and the ventilation filter is disposed on the body to cover the first vent hole. The cover member is coupled to the body to cover the ventilation filter, and the legs are formed beneath the body and are spaced apart from each other around the first vent hole. Further, the legs are received in a hole defined in a target housing to be coupled to the target housing, and a second vent hole communicating with the first vent hole is defined in a side portion of the cover member.