A communication apparatus detects the start and end of a frame of a video, and notifies information indicating that the start of the frame of the video is detected and information indicating that the end of the frame of the video is detected to a communication unit that performs communication access control and that is included in the communication apparatus. An embodiment may comprise an IC having two tuners. 01 to 3% by weight of an antidrop agent, and E) from 0 to 70% by weight of other additives, where the total of the percentages by weight of components A) to E) is 100%. The stop includes at least one axially protruding first stop cam that is formed on the third fitting part and at least one axially protruding second stop cam that is formed on the locking element.